{"id":450,"date":"2026-10-03T06:00:30","date_gmt":"2026-10-03T03:00:30","guid":{"rendered":"https:\/\/wpcalc.com\/fr\/?p=450"},"modified":"2026-10-03T06:00:30","modified_gmt":"2026-10-03T03:00:30","slug":"calculateur-equations-cinematique","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/fr\/physique\/calculateur-equations-cinematique\/","title":{"rendered":"Calculateur des \u00e9quations de la cin\u00e9matique"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">R\u00e9solvez les \u00e9quations de la cin\u00e9matique<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"450\" data-favorite-title=\"\u00c9quations de la cin\u00e9matique\" data-favorite-url=\"https:\/\/wpcalc.com\/fr\/physique\/calculateur-equations-cinematique\/\" data-favorite-excerpt=\"Calculez n\u2019importe quelle variable manquante dans un mouvement \u00e0 acc\u00e9l\u00e9ration constante. Saisissez les valeurs connues, choisissez la variable \u00e0 calculer \u2014 vitesse initiale, vitesse finale, acc\u00e9l\u00e9ration, temps ou d\u00e9placement \u2014 et obtenez une r\u00e9ponse instantan\u00e9e gr\u00e2ce aux \u00e9quations SUVAT.\" aria-label=\"Ajouter aux favoris\" data-favorite-icon=\"icon icon-content-360deg\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/fr\/physique\/calculateur-equations-cinematique\/\" method=\"POST\" class=\"calculator\" id=\"calculator-450\" data-post=\"450\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Champs de saisie<\/legend><div class=\"field is-single\" id=\"input-1\"><label for=\"field-1\">Vitesse initiale (u)<\/label><div class=\"field-group\"><input type=\"number\" name=\"vitesse_initiale_u\" id=\"field-1\" step=\"any\" value=\"10\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"m\/s\">m\/s<\/option><option value=\"km\/h\">km\/h<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field is-single\" id=\"input-2\"><label for=\"field-3\">Vitesse finale (v)<\/label><div class=\"field-group\"><input type=\"number\" name=\"vitesse_finale_v\" id=\"field-3\" step=\"any\" value=\"30\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"m\/s\">m\/s<\/option><option value=\"km\/h\">km\/h<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field is-single\" id=\"input-3\"><label for=\"field-5\">Acc\u00e9l\u00e9ration (a)<\/label><input type=\"number\" name=\"acclration_a\" id=\"field-5\" aria-describedby=\"calc-unit-5\" step=\"any\" value=\"4\"\/><div class=\"unit\" id=\"calc-unit-5\">m\/s\u00b2<\/div><\/div><div class=\"field is-single\" id=\"input-4\"><label for=\"field-6\">Temps (t)<\/label><div class=\"field-group\"><input type=\"number\" name=\"temps_t\" id=\"field-6\" step=\"any\" value=\"5\"\/><div class=\"grid grid-cols-1\"><select id=\"field-7\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"s\">s<\/option><option value=\"min\">min<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field is-single\" id=\"input-5\"><label for=\"field-8\">D\u00e9placement (s)<\/label><div class=\"field-group\"><input type=\"number\" name=\"dplacement_s\" id=\"field-8\" step=\"any\" value=\"100\"\/><div class=\"grid grid-cols-1\"><select id=\"field-9\" name=\"unit\" aria-label=\"Unit\u00e9\"><option value=\"m\">m<\/option><option value=\"km\">km<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field is-single\" id=\"input-6\"><label for=\"field-10\">Calculer<\/label><div class=\"grid grid-cols-1\"><select id=\"field-10\" name=\"calculer\"><option value=\"u\">Vitesse initiale (u)<\/option><option value=\"v\">Vitesse finale (v)<\/option><option value=\"a\">Acc\u00e9l\u00e9ration (a)<\/option><option value=\"t\">Temps (t)<\/option><option value=\"s\">D\u00e9placement (s)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalculer\" id=\"calculate-button\" data-post=\"450\">Calculer<\/button><button type=\"reset\">R\u00e9initialiser<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculer automatiquement<\/label><small>Si activ\u00e9, le r\u00e9sultat se met \u00e0 jour automatiquement d\u00e8s que vous modifiez une valeur.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> R\u00e9sultats de cin\u00e9matique<\/h3><div class=\"result-box\"><div class=\"field-result is-column\" id=\"output-1\"><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copier le r\u00e9sultat\" aria-label=\"Copier le r\u00e9sultat\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copier le lien vers ce calcul<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Laisser un commentaire<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"450\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">Que pensez-vous de ce r\u00e9sultat\u00a0?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">J\u2019aime <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Utile <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confus <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">D\u00e9\u00e7u <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inexact <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Formules des \u00e9quations de la cin\u00e9matique<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formule<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ v = u + at \\\\ s = ut + \\frac{1}{2}at^2 \\\\ v^2 = u^2 + 2as \\\\ u = v - at \\\\ a = \\frac{v - u}{t} \\\\ t = \\frac{v - u}{a} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Avec&nbsp;:<\/strong><\/p>\n<ul>\n<li>\\(u\\) \u2014 vitesse initiale (m\/s)<\/li>\n<li>\\(v\\) \u2014 vitesse finale (m\/s)<\/li>\n<li>\\(a\\) \u2014 acc\u00e9l\u00e9ration constante (m\/s\u00b2)<\/li>\n<li>\\(t\\) \u2014 temps \u00e9coul\u00e9 (s)<\/li>\n<li>\\(s\\) \u2014 d\u00e9placement (m)<\/li>\n<\/ul>\n<p>Ce sont les \u00e9quations SUVAT du mouvement \u00e0 acc\u00e9l\u00e9ration constante. Chaque \u00e9quation relie quatre des cinq variables&nbsp;: il suffit donc de conna\u00eetre trois valeurs pour calculer la quatri\u00e8me.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>\u00c9quations de la cin\u00e9matique \u2013 Exemple de calcul<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemple&nbsp;:<\/strong> une moto acc\u00e9l\u00e8re \u00e0 \\(4\\ \\text{m\/s}^2\\) pendant \\(5\\ \\text{s}\\) et atteint une vitesse finale de \\(30\\ \\text{m\/s}\\). Quelle \u00e9tait sa vitesse initiale ?<\/p>\n<p>\\[ u = v - at = 30 - 4 \\times 5 = 30 - 20 = 10\\ \\text{m\/s} \\]<\/p>\n<p><strong>R\u00e9sultat&nbsp;:<\/strong> la vitesse initiale \u00e9tait de \\(10\\ \\text{m\/s}\\) (environ \\(36\\ \\text{km\/h}\\)). Vous pouvez retrouver ce r\u00e9sultat en saisissant 30 m\/s, 4 m\/s\u00b2 et 5 s, puis en s\u00e9lectionnant <em>Vitesse initiale (u)<\/em> dans le calculateur.<\/p>\n<p>\n\r\n<\/section>\n<h2>Comment utiliser le calculateur des \u00e9quations de la cin\u00e9matique<\/h2>\n<ol>\n<li>Laissez vide le champ correspondant \u00e0 la variable que vous souhaitez calculer&nbsp;: le calculateur le masque automatiquement lorsque vous la s\u00e9lectionnez.<\/li>\n<li>Saisissez les valeurs connues dans les champs <em>Vitesse initiale (u)<\/em>, <em>Vitesse finale (v)<\/em>, <em>Acc\u00e9l\u00e9ration (a)<\/em>, <em>Temps (t)<\/em> et <em>D\u00e9placement (s)<\/em>.<\/li>\n<li>Choisissez l\u2019unit\u00e9 correspondant \u00e0 chaque valeur&nbsp;: m\/s ou km\/h pour les vitesses, s ou min pour le temps, m ou km pour le d\u00e9placement. L\u2019acc\u00e9l\u00e9ration se saisit toujours en m\/s\u00b2.<\/li>\n<li>Ouvrez le menu d\u00e9roulant <em>Calculer<\/em> et choisissez la variable souhait\u00e9e&nbsp;: <em>Vitesse initiale (u)<\/em>, <em>Vitesse finale (v)<\/em>, <em>Acc\u00e9l\u00e9ration (a)<\/em>, <em>Temps (t)<\/em> ou <em>D\u00e9placement (s)<\/em>.<\/li>\n<li>Consultez la r\u00e9ponse sous <em>R\u00e9sultats de cin\u00e9matique<\/em>, affich\u00e9e dans le syst\u00e8me d\u2019unit\u00e9s que vous avez s\u00e9lectionn\u00e9.<\/li>\n<\/ol>\n<p>Le calculateur convertit en interne les km\/h, les minutes et les kilom\u00e8tres en unit\u00e9s SI, applique l\u2019\u00e9quation SUVAT r\u00e9arrang\u00e9e appropri\u00e9e, puis reconvertit le r\u00e9sultat dans l\u2019unit\u00e9 choisie.<\/p>\n<h2>Que sont les \u00e9quations de la cin\u00e9matique ?<\/h2>\n<p>Les \u00e9quations de la cin\u00e9matique \u2014 souvent appel\u00e9es \u00e9quations SUVAT d\u2019apr\u00e8s les cinq symboles \\(s\\), \\(u\\), \\(v\\), \\(a\\), \\(t\\) \u2014 d\u00e9crivent le mouvement d\u2019un objet qui se d\u00e9place en ligne droite avec une acc\u00e9l\u00e9ration <em>constante<\/em>. Elles se d\u00e9duisent des d\u00e9finitions de la vitesse et de l\u2019acc\u00e9l\u00e9ration \u00e0 l\u2019aide du calcul diff\u00e9rentiel, mais vous n\u2019avez pas besoin de ma\u00eetriser celui-ci pour les utiliser : chaque \u00e9quation exprime simplement une relation entre quatre des cinq variables.<\/p>\n<p>L\u2019\u00e9quation \u00e0 utiliser d\u00e9pend des valeurs connues et de celle que vous cherchez&nbsp;:<\/p>\n<ul>\n<li>Pour calculer la vitesse finale \u00e0 partir de \\(u\\), \\(a\\) et \\(t\\) : utilisez \\(v = u + at\\).<\/li>\n<li>Pour calculer le d\u00e9placement \u00e0 partir de \\(u\\), \\(a\\) et \\(t\\) : utilisez \\(s = ut + \\frac{1}{2}at^2\\).<\/li>\n<li>Pour relier les vitesses et le d\u00e9placement sans conna\u00eetre le temps : utilisez \\(v^2 = u^2 + 2as\\).<\/li>\n<li>Pour retrouver la vitesse initiale, l\u2019acc\u00e9l\u00e9ration ou le temps, r\u00e9arrangez \\(v = u + at\\) sous la forme \\(u = v - at\\), \\(a = \\frac{v-u}{t}\\) ou \\(t = \\frac{v-u}{a}\\).<\/li>\n<\/ul>\n<p>Ce calculateur effectue le bon r\u00e9arrangement \u00e0 votre place, ce qui \u00e9limine la source d\u2019erreur la plus fr\u00e9quente dans les probl\u00e8mes de cin\u00e9matique. Il est utile pour les devoirs de physique, l\u2019\u00e9tude de la dynamique des v\u00e9hicules, l\u2019estimation des freinages et des acc\u00e9l\u00e9rations, ainsi que pour tout mouvement rectiligne o\u00f9 l\u2019acc\u00e9l\u00e9ration ne varie pas.<\/p>\n<p>Si votre probl\u00e8me porte sur un mouvement en deux dimensions, les m\u00eames \u00e9quations s\u2019appliquent s\u00e9par\u00e9ment aux composantes horizontale et verticale : c\u2019est exactement ainsi que l\u2019on analyse le <a href=\"https:\/\/wpcalc.com\/fr\/physique\/calculateur-tir-parabolique\/\">mouvement d\u2019un projectile<\/a>. Pour un mouvement soumis uniquement \u00e0 la gravit\u00e9, consultez le <a href=\"https:\/\/wpcalc.com\/fr\/physique\/calculateur-chute-libre\/\">calculateur de chute libre<\/a>&nbsp;; pour les probl\u00e8mes de freinage, le <a href=\"https:\/\/wpcalc.com\/fr\/physique\/calculateur-distance-arret\/\">calculateur de distance d\u2019arr\u00eat<\/a> est un compl\u00e9ment naturel.<\/p>\n<h2>Hypoth\u00e8ses, limites et conseils pratiques<\/h2>\n<ul>\n<li><strong>Acc\u00e9l\u00e9ration constante uniquement.<\/strong> Les \u00e9quations SUVAT ne sont pas valables si l\u2019acc\u00e9l\u00e9ration varie pendant le mouvement (par exemple, si la r\u00e9sistance de l\u2019air augmente avec la vitesse). Pour un mouvement \u00e0 acc\u00e9l\u00e9ration variable, il faut recourir au calcul diff\u00e9rentiel ou \u00e0 des m\u00e9thodes num\u00e9riques.<\/li>\n<li><strong>Mouvement rectiligne.<\/strong> Le d\u00e9placement \\(s\\) se mesure le long de la ligne de mouvement. Dans les probl\u00e8mes en 2D ou en 3D, appliquez les \u00e9quations s\u00e9par\u00e9ment \u00e0 chaque axe de coordonn\u00e9es.<\/li>\n<li><strong>Le calcul du temps ou de l\u2019acc\u00e9l\u00e9ration utilise les vitesses.<\/strong> Le calculateur utilise \\(a = (v-u)\/t\\) et \\(t = (v-u)\/a\\) : veillez donc \u00e0 ce que les vitesses saisies soient coh\u00e9rentes avec le sens de l\u2019acc\u00e9l\u00e9ration.<\/li>\n<li><strong>Attention \u00e0 la division par z\u00e9ro.<\/strong> Le calcul de \\(t\\) exige une acc\u00e9l\u00e9ration non nulle ; si \\(a = 0\\), la vitesse ne change jamais et le temps ne peut pas \u00eatre d\u00e9termin\u00e9 \u00e0 partir des seules vitesses.<\/li>\n<li><strong>Les signes comptent.<\/strong> Les vitesses et l\u2019acc\u00e9l\u00e9ration peuvent \u00eatre n\u00e9gatives. Un r\u00e9sultat n\u00e9gatif signifie que la grandeur est orient\u00e9e dans le sens oppos\u00e9 \u00e0 celui que vous avez choisi comme positif&nbsp;: une d\u00e9c\u00e9l\u00e9ration correspond, par exemple, simplement \u00e0 une valeur n\u00e9gative de \\(a\\).<\/li>\n<li><strong>V\u00e9rifiez la coh\u00e9rence.<\/strong> Si vous saisissez les cinq valeurs, v\u00e9rifiez qu\u2019elles satisfont aux \u00e9quations (c\u2019est le cas des valeurs par d\u00e9faut : \\(10 + 4 \\times 5 = 30\\) et \\(10 \\times 5 + \\frac{1}{2} \\times 4 \\times 25 = 100\\)).<\/li>\n<\/ul>\n<p>Pour les probl\u00e8mes courants o\u00f9 l\u2019acc\u00e9l\u00e9ration est inconnue et o\u00f9 vous ne connaissez que des distances et des dur\u00e9es, le <a href=\"https:\/\/wpcalc.com\/fr\/physique\/calculateur-vitesse-moyenne\/\">calculateur de vitesse moyenne<\/a> peut \u00eatre l\u2019outil le plus simple.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calculez n\u2019importe quelle variable manquante dans un mouvement \u00e0 acc\u00e9l\u00e9ration constante. Saisissez les valeurs connues, choisissez la variable \u00e0 calculer \u2014 vitesse initiale, vitesse finale, acc\u00e9l\u00e9ration, temps ou d\u00e9placement \u2014 et obtenez une r\u00e9ponse instantan\u00e9e gr\u00e2ce aux \u00e9quations SUVAT.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13],"tags":[14],"class_list":["post-450","post","type-post","status-publish","format-standard","hentry","category-physique","tag-mecanique"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/450","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/comments?post=450"}],"version-history":[{"count":6,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/450\/revisions"}],"predecessor-version":[{"id":5342,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/posts\/450\/revisions\/5342"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/media?parent=450"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/categories?post=450"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/fr\/wp-json\/wp\/v2\/tags?post=450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}