Name: quadratic motion and parabolas
Uploaded: 2025-11-26T05:43:59.000Z
Duration: 1 min 23 s
Channel: JoVE

Lorsqu’une balle est lancée dans les airs, elle suit une trajectoire courbe appelée mouvement de projectile, c’est-à-dire la trajectoire empruntée par un objet sous l’influence de la gravité.Ce mouvement vertical sous accélération constante est modélisé à l’aide d’une fonction quadratique du temps. La fonction comporte trois termes : un terme t au carré, un terme t et une constante.La représentation graphique de cette fonction est une parabole s’ouvrant vers le bas. Il montre la balle s’élever, atteindre son point le plus élevé, puis retomber.En complétant le carré, l’équation est réécrite sous la forme standard d’une parabole, révélant le sommet, le point le plus élevé du mouvement. Le moment où cela se produit est donné par moins b sur 2a.Chaque terme de l’équation du second degré représente une grandeur physique qui affecte la hauteur de la balle.Le terme t au carré reflète l’accélération constante due à la gravité, qui courbe la trajectoire vers le bas.Le coefficient du linéaire t représente la vitesse initiale, qui détermine la vitesse à laquelle la balle se lève.Le terme constant représente la hauteur initiale à partir de laquelle la balle est lancée.En utilisant les coefficients mis à jour, la substitution de la valeur temporelle dans la fonction donne le point le plus élevé de la trajectoire de la balle.

modèles quadratiques

Les mod&#232;les quadratiques sont des repr&#233;sentations math&#233;matiques servant &#224; d&#233;crire des relations dans lesquelles le taux de variation change &#224; un rythme constant. Ces mod&#232;les apparaissent dans de nombreux syst&#232;mes naturels et techniques, en particulier ceux li&#233;s au mouvement, aux forces et &#224; l&#8217;optimisation. Une application classique consiste &#224; analyser le mouvement vertical d&#8217;un objet soumis &#224; la gravit&#233;, comme une balle lanc&#233;e vers le haut. 
Dans de telles situations, la hauteur de l&#8217;objet varie au fil du temps selon une trajectoire courbe : elle augmente jusqu&#8217;&#224; atteindre un maximum, puis diminue. Cette trajectoire refl&#232;te l&#8217;action continue de la gravit&#233;, qui ralentit la mont&#233;e de l&#8217;objet et acc&#233;l&#232;re sa descente. La forme de ce mouvement est d&#233;crite par une parabole, caract&#233;ristique d&#8217;un comportement quadratique.
Le sommet de la trajectoire, correspondant au moment o&#249; l&#8217;objet atteint sa plus grande hauteur, co&#239;ncide avec le sommet de la parabole. Ce point marque la transition entre la phase ascendante et la phase descendante du mouvement, et il joue un r&#244;le essentiel dans la compr&#233;hension de la trajectoire compl&#232;te.
Les mod&#232;les quadratiques pr&#233;sentent un int&#233;r&#234;t consid&#233;rable non seulement pour l&#8217;&#233;tude du mouvement, mais &#233;galement pour la r&#233;solution de probl&#232;mes dans des disciplines telles que la physique, l&#8217;ing&#233;nierie, l&#8217;&#233;conomie ou la biologie. Ils fournissent un &#233;clairage sur des syst&#232;mes o&#249; l&#8217;&#233;volution suit une tendance courbe et pr&#233;visible, permettant une analyse et des pr&#233;visions pr&#233;cises.

Modèles quadratiques

Les mod&#232;les quadratiques sont des repr&#233;sentations math&#233;matiques servant &#224; d&#233;crire des relations dans lesquelles le taux de ...

Education

Enseignement

JoVE Core

Math Fundamentals

Fondamentaux des mathématiques

Unit

Unité

Polynomial and Rational Functions

Fonctions polynomiales et rationnelles

KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

Quadratic Models

quadratic motion and parabolas

Quadratic models describe relationships where the rate of change changes at a constant rate. In math and science, this often shows up as a curved pattern called a parabola. These models help explain how a system changes over time or under a set force.

A common example is the vertical motion of an object moving under gravity, such as a ball thrown into the air. The object rises to a maximum height and then falls back down. Gravity slows the ascent and speeds up the descent, which creates the curved path seen in a quadratic model.

The highest point of that path is the turning point of the parabola. At this point, the motion changes from upward to downward. Knowing the turning point helps students describe the full trajectory of the object.

Quadratic models are also useful in physics, engineering, economics, and biology. They support analysis in systems where change follows a predictable curved pattern. That makes them useful for understanding results and making forecasts in many real-world situations.

Quadratic Motion and Parabolas

quadratic models

Quadratic models describe relationships where the rate of change changes at a constant rate. In math and science, this often shows up as a curved pattern called a parabola. These models help explain how a system changes over time or under a set force. A common example is the vertical motion of an object moving under gravity, such as a ball thrown into the air. The object rises to a maximum height and then falls back down. Gravity slows the ascent and speeds up the descent, which creates the...

introduction to polynomial functions

Polynomial Graphs, Zeros, and Degree

Polynomial functions are an important part of algebra and calculus. They are made from variables and constants combined by addition, subtraction, and multiplication. The variable is raised to a nonnegative integer exponent. A general polynomial function of degree n has a leading term aₙxⁿ, where aₙ is not equal to 0. The coefficient aₙ is the leading coefficient, and a₀ is the constant term. Polynomials are grouped by degree. A constant function has degree zero, a linear function has degree...

long division of polynomials

Polynomial Division: Quotient and Remainder

Polynomial division breaks a polynomial into a quotient and a remainder. It works like numerical division, but the dividend is a polynomial and the divisor is an algebraic expression. The result shows how much of the divisor fits into the dividend and what is left over. The first step is to write both polynomials in standard form, with terms in descending powers of the variable. Then divide the leading term of the dividend by the leading term of the divisor. That first result becomes the first...

synthetic disvision of polynomials

Using Synthetic Division to Find Factors

Synthetic division is a fast way to divide a polynomial by a linear binomial of the form x - c, where c is a real number. It gives a shorter method than polynomial long division and is useful for checking values and finding factors. The setup starts with the coefficients of the polynomial written in descending order of powers. If a term is missing, a zero must be used to keep the columns lined up. The constant c from the divisor x - c is placed to the left of the synthetic division table. The...

real zeros of polynomials

Finding Polynomial X-Intercepts

Polynomials can be analyzed by finding their real zeros, which are the values of x that make the polynomial equal to zero. These points are also the x-intercepts of the graph. Understanding them helps students see where a polynomial crosses the x-axis. The Rational Zeros Theorem gives a list of possible rational solutions for a polynomial with integer coefficients. If f(x)=anx^n+...+a0, then every rational zero has the form p/q. In that form, p divides the constant term a0 and q divides the...

fundamental theorem of algebra

Polynomial Roots in Complex Numbers

Polynomial roots in complex numbers are a key result in algebra. The Fundamental Theorem of Algebra says that every non-constant polynomial with complex coefficients has at least one complex zero. For a polynomial of degree n, where n is at least 1 and the leading coefficient a n is not 0, there is at least one solution in the complex number system. This result also applies to polynomials with real coefficients, because the real numbers are a subset of the complex numbers. The Complete...

complex zeros

Finding Polynomial Roots With Complex Numbers

Complex numbers help describe every root of a polynomial equation. A complex number has the form a + bi, where a and b are real numbers and i is the imaginary unit, with i^2 = -1. A complex zero is any value that makes P(x) = 0 for a polynomial P(x). The complex number system includes the real numbers, so it gives a complete way to study polynomial roots. Every polynomial of degree n  1 can be written as a product of n linear factors over the complex numbers. In that factorization, each c_i...

asymptotes in rational functions

Graphing Rational Functions with Asymptotes

Rational functions are quotients of two polynomials, with the denominator Q(x) not equal to zero. Their graphs often include asymptotes, which are lines the graph gets close to but does not touch. These lines help show how the function behaves near certain input values and at large values of x. A vertical asymptote appears when the denominator is zero and the numerator is not zero. At those x-values, the function is undefined. To find a vertical asymptote, solve Q(x) = 0. For example, a...

introduction to nonlinear inequalities

Graphing and Solving Nonlinear Inequalities

Linear and nonlinear inequalities help describe variable relationships and the ranges that satisfy a condition. A linear inequality uses variables raised only to the first power. Its graph is a straight line that divides the coordinate plane into two regions. One region satisfies the inequality, and the other does not. Nonlinear inequalities use variables raised to powers greater than one. These include quadratic inequalities and higher-degree polynomial inequalities. Their graphs are curved,...

application of nonlinear inequalities

Solving Nonlinear Inequalities on a Number Line

Nonlinear inequalities can be solved by checking where an expression is positive or negative on a number line. These inequalities often include squares, products, or variables in the denominator, so they do not follow the same simple pattern as linear inequalities. The first step is to rewrite the inequality so that zero is on one side. After rewriting, factor the expression if possible. Factoring helps you find the key values where the expression equals zero. In one example, the values 3 and...

key terms and concepts

Learn how quadratic models describe curved motion, including a ball thrown into the air, and how the turning point shows the highest point of a parabola.

Quadratic Motion and Parabolas | JoVE K12

The JoVE Math Fundamentals collection is designed to build a deep and comprehensive understanding of essential mathematics. Covering the foundations of algebra, geometry, trigonometry, and analytic reasoning, this course establishes a strong base for future studies. The collection connects core mathematical concepts with real-world practice, equipping learners to solve complex problems, master problem-solving skills, and apply abstract ideas.

math fundamentals

Quadratic Motion and Parabolas

Description

Transcript

Tags