This document discusses different types of energy including kinetic energy and potential energy. Kinetic energy is the energy of motion and is calculated using the formula KE=1/2mv^2, where m is mass and v is velocity. Potential energy is energy due to an object's position or state and is calculated using the formula PE=mgh, where m is mass, g is the acceleration due to gravity, and h is height. Examples are provided to demonstrate calculating the kinetic energy of a moving car and the potential energy of a rock located above the ground.

2. Name : ANANDU PRASAD
Subject : Physical Science
Reg. No. : 13360002
College of Teacher Education
Arkkannoor

3. Kinetic Energy
and
Potential Energy

4. What is Energy?
What does it mean if you
have a lot of energy?
For students it means you
can run around, lift weights
and scream.
If you have energy you can
do things.

5. What is Energy?
Energy is the ability to do work
This is similar to our every day definition of
energy. You can’t run up the stairs (work)
without energy!

6. Energy comes in many different
forms
• Kinetic Energy
• Gravitational potential energy
• Thermal Energy (heat)
• Nuclear Energy (nuclear power, atomic bomb)
• Electrical Energy (electricity)
• Chemical Energy (food, fire, …)

7. Kinetic Energy
Kinetic energy is the energy of
motion
KE = ½ mv2
m = mass
v = velocity
Unit: Joules (J)

8. What is the kinetic energy of
this car when it is traveling
in 38.0 m/s?
Answer:
KE = ½ mv2
= ½ (1550)(38.0)2
= 1119100 J
= 1.11 x 106 J
Car’s mass = 1550kg

9. Potential Energy
Gravitational Potential Energy is
energy due to an object’s
height above the ground
PE = mgh
m = mass
g = acceleration due to gravity
h = height

10. A rock has a mass of 8.40 x 104 kg.
The center of mass is 29.0 m
above the ground. How much
energy does it have?
Answer:
PE = mgh
m= 8.40 x 104 kg
g= 9.81( m/s)2
h= 29.0 m
PE = (8.4X104)(9.81)(29)
= 2.39 x 107 J