Kinetic energy is the energy of an object due to its motion. It is proportional to the mass of the object and the square of its speed. Potential energy is stored energy due to an object's position or state. Gravitational potential energy depends on an object's mass and its height above a reference point and is calculated using the equation PE=mgh. Examples of kinetic energy include moving cars and flying balls, while examples of potential energy include stacked books and objects at high elevations.

2. KINETIC
ENERGY
01
- Energy in motion

3. What is kinetic energy?
Kinetic energy is the energy relative
to the motion of an object.
- The energy an object has when it
moves from rest.

4. Examples:
1. moving cars
2. a bullet in motion
3. Electric Fan

5. KE = 1
2
EQUATION:
mv2
Where:
KE = (joules)
m = (kg)
v = (m/s)
Kinetic energy is directly proportional to the square of its speed

6. 1. A cyclist and bike have a total
mass of 100 kg and a speed of 15
m/s. Calculate the kinetic energy.
Sample problem:

7. 2. A tennis ball is traveling at
50 m/s and has a kinetic
energy of 75 J. Calculate the
mass of the tennis ball.
●
Sample problem:

8. POTENTIAL
ENERGY
02
- Stored Energy

9. What is Potential Energy?
Potential energy is the stored energy
relative to the position of an object. It
depends on the height of an object
relative to a reference point. The
higher an object is positioned, the
greater the gravitational potential
energy.

10. Examples:
1. a pile of books on top of the table
2. a stone positioned at the top of the
building
3. a car parked up on a ramp
4. Can be stored in a stretched or
compressed elastic material, such as
springs.

11. PE grav = W = F d = m g h
Weight = m x g
EQUATION

12. PE grav = mgh
PE grav = (joules)
m= mass (kg)
g = 9.8 m/s2
(acceleration due to
gravity)
h = height relative to
the reference point (m)
EQUATION

13. 1. Who has a greater Gravitational Potential
Energy?
2. Who exerted a greater force?
A. Girl who walks up the stairs
B. Boy who climbs up the ladder
SITUATION

14. Find the Gravitational Potential
Energy of a ball with a mass of
0.2 kg lifted 5 m above the
ground .
Sample Problem:

15. An object has a mass of 5 kg.
Calculate its potential energy 3 m
above the ground.
Sample Problem: