ICT workshop- Digital text
KINETIC ENERGY
NSS TRAINING COLLEGE OTTAPALAM- ICT WORKSHOP
DIGITAL TEXT
Name of the teacher :PRAVEENA K
Date : 20/5/22
Department : Physical Science
Class : 9th
Subject : Physics
Duration : 40 minutes
Unit : Work, Energy and Power
Topic : Kinetic Energy
Objectives:
The study of kinetic energy helps
To understand the energy possessed by objects due to its motion and define it.
To give examples of objects having kinetic energy.
To analyse situations and distinguish if objects possess kinetic energy or not.
To understand the two factors affecting kinetic energy.
To give the equation of kinetic energy for solving numerical problems.
Energy is defined as the capacity to do work.
Work is done to displace the box from position1 to position2 shown in the figure.
Work, W= Force * Displacement
If F is the force and d is the displacement, W=F*d
Unit of work is Joule or Newton second.
There are different forms of energy that we see around us in daily life. The given image illustrates some of them.
Among the different forms of energy mechanical energy is one of the important.
Mechanical energy otherwise known as moving energy consist of two types
1. Kinetic energy 2. Potential energy
Consider the situation of a toy car hitting a plastic ball kept at rest as shown in the figure.
What happens to the ball when the car hits?
Is there any force applied on the ball?
Is there any work done on the ball?
How did the car get the energy to hit the ball?
ANSWERS
The ball got displaced when the car hits
Force was applied on the ball by the car
Yes, work was done on the ball by the car
Work done= Force * Displacement
W=F*d
The car gets energy to hit the ball by its motion.
Kinetic Energy Definition
The energy possessed by a body by virtue of its motion is the kinetic energy.
Examples: - Car moving on a road, ball rolling down a hill.
Analyze the situations shown above and make a table of objects having kinetic energy and objects which do not have kinetic energy.
OBJECTS HAVING KINETIC ENERGY
Flying aircraft
Bullet fired from gun
Running animal
OBJECTS NOT HAVING KINETIC ENERGY
Dog sleeping
Vehicles parked
Boy standing
Factors affecting kinetic energy
Experiment 1 : When ball rolling down from slopes of different heights hit a car at rest on the bottom of slope, the velocity of motion changes in different cases and motion of car will be more when velocity is high.
Experiment 2: When paper cups are strike with balls of different mass, the cups have more displacement when mass of ball is high.
Thus the two factors affecting kinetic energy are
1. Velocity of the moving body
2. Mass of the moving body
For Kinetic Energy digital text please
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