Kinetic Equations For Uniformly Accelerated Motion
Chapter Name : Motion In A Straight Line |
Sub Topic Code : 101_11_03_06_01 |
Topic Name : Kinetic Equations For Uniformly Accelerated Motion |
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Sub Topic Name : Kinetic Equations For Uniformly Accelerated Motion |
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Introduction
The kinetic equations for uniformly accelerated motion are: • v = u + at • s = ut + ½ at^2 • v^2 = u^2 + 2as Where s, t, u , v and a are displacement, time, initial velocity, final velocity and acceleration respectively.
Pre-Requisites:
Displacement, velocity, acceleration
Activity:
Deriving the three kinematic equations of uniform accelerated motion. Understanding the concept of free fall.
Real Life Question:
How much time does a vehicle takes to stop after the brakes are applied and how much distance does it cover before it stops?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Uniform accelerated motion | If the value of acceleration remains constant, then the body is said to be in uniform accelerated motion. |
| Free fall | Type of motion in which an object is released towards the Earth’s surface under the influence of gravity and the air resistance is neglected. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Brakes of a car | Observe how we use these kinetic equations to calculate how much time a car takes to stop after the brakes are applied? |
Real life uses :
The three kinetic equations are very useful in understanding the concept of free fall and are applicable to every uniformly accelerated object.
Places to visit :
Take a drive in your car and calculate how much time it takes to stop after you apply the brakes.
Practical examples around us
| Examples | Explainations |
|---|---|
| Freely falling object | When an object is released towards the Earth’s surface under the influence of gravity and the air resistance is neglected, it is said to be in uniformly accelerated motion as the acceleration is constant. |
What you learn in Theory:
What is uniformly accelerated motion, free fall and deriving the kinetic equations?
What you learn in Practice:
Day-to-day examples of uniformly accelerated motion including free fall.