Test Review

Explain what happens to the potential energy of a rock as it falls off the side of a cliff.

• The kinetic energy decreases as the potential energy increases.
• The kinetic energy decreases as the potential energy decreases.
• The potential energy decreases as the kinetic energy increases.
• The potential energy decreases as the kinetic energy decreases. 

When riding a roller coaster, you go up and down many hills. As you get to the top of a roller coaster, what energy change is taking place.

• Potential energy is changed into kinetic energy.
• Kinetic energy is changed into potential energy.
• Chemical energy is changed into heat energy.
• Heat energy is changed into chemical energy. 

Which passenger has the most potential energy?

• A

• B

• C

• D

Gravitational potential energy depends on the ________ and ________ of the object.

• Height and mass

• Friction and movement

• Mass and Movement

• Height and Friction

What is the potential energy of a person flying down from a height of 1000 m that has a mass of 70 kg?

• 1070 N

• 70000 N

• 686,000 N

• 9800

What is the potential of a soccer ball that is coming down if it has a mass of 0.35 kg and is coming down from a height of 7 meters.

• 2.45 N

• 24.01 N

• 3.43 N

• 68.6 N

What is the energy of a 1325 kg mass that is rolling at a speed of 1.5 m/sec?

• 19.4775 J

• 19477.5 J

• 1490.625 J

• 1.497 J

What is the energy of a 35 kg mass that is falling at a speed of 2 m/sec?

• 35 J

• 70 J

• 686 J

• 37 J

What is the KE of a football which has a mass of 0.8 kg and is kicked at a velocity of 10m/s.

• 80 J

• 3.2 J

• 160 J

• 40 J

You serve a volley ball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30m/s. The ball has ____ kinetic energy. Calculate it.

• 1890 J

• 3780 J

• 945 J

• 31.5 J