Energy Notes

Energy Notes

There are many types of Energy

How much potential energy does a
2kg book have on a shelf…

3 m high

6 m high

PE = m g h

PE = (2)(10)(3)

PE = 60 Joules

PE = (2)(10)(6)

These two forms of energy are known as MECHANICAL Energy

Total mechanical energy = PE + KE

In this unit we will focus on
Potential Energy and Kinetic Energy

There are many types of Energy

• Is energy of motion

• depends on mass and velocity

• Units for Energy = Joules (J)

Kinetic Energy

Multiple Choice

What is the Kinetic Energy (KE) of a car that has zero velocity?

• 100 J
• 50 J
• 0 J

• 10 J

Multiple Choice

If you double the velocity the kinetic energy becomes _______________ times as much

• 4
• 2
• 3
• 5

• Is energy of position

• depends on mass, gravity and height

• Units for Energy = Joules (J)

Potential Energy

Multiple Choice

If you double the height the Potential Energy (PE) becomes ________________ times as much

• 3
• 4
• 2
• 1

Multiple Choice

A 2 kg ball is flying through the air at a height of 4 m, with a speed of 3 m/s. What is the PE of the ball?

• 30 J
• 50 J
• 100 J
• 80 J

Multiple Choice

A 2 kg ball is flying through the air at a height of 4 m, with a speed of 3 m/s. What is the KE of the ball?

• 9 J
• 12 J
• 6 J
• 15 J

Multiple Choice

What is the potential energy of a 6kg bird flying 5 m above the ground at a speed of 8 m/s?

• 500 J
• 300 J

• 150 J
• 75 J

Multiple Choice

What is the kinetic energy of a 6kg bird flying 5 m above the ground at a speed of 8 m/s?

• 64 Joules
• 128 Joules
• 192 Joules
• 256 Joules