K.E. Formative

Which of the following statements is correct?

• The car has less kinetic energy because it has more mass than the girl.

• The car has the most kinetic energy because it has more mass than the girl.

• The car and the girl have the same amount of kinetic energy because they are moving at the same speed.

• The girl has the most kinetic energy because she has less mass than the car.

Why does a soccer ball eventually stop rolling once it’s kicked on a grassy field?

• none of these

• Gravity acts upon it.

• Light acts upon it.

• Friction acts upon it.

A sled starts at rest with 51,450 J of potential energy. After traveling part of the way down the slope, the sled has 32,781 J of potential energy. If there is no friction, what is the kinetic energy of the sled?

• 18,669 J

• 51,450 J

• 84,231 J

• 32,781 J

Car 1 and Car 2 have the same mass. Which of the following statements is true?

• Car 1 has the most kinetic energy because it is moving at a faster rate of speed.

• Car 2 has the least amount of kinetic energy because it is actually smaller than car one.

• Car 2 has the most kinetic energy because it is moving at a slower rate of speed.

• Car 1 has the least amount of kinetic energy because it is moving at a faster rate of speed.

Which of the following is a correct statement?

• Both the mass and speed of an object affect the amount of kinetic energy it will have.

• Only the speed of an object affects the amount of kinetic energy it will have.

• Only the mass of an object affects the amount of kinetic energy it will have.

• Neither the mass nor speed of an object affects the amount of kinetic energy; only the height of the object.

Why does a brick that is thrown into the air fall back down?

• Gravity acts upon it.

• Friction acts upon it.

• none of these

• Light acts upon it.

How could you increase the number of snowmen destroyed by the sled sliding down the hill?

• Increase the starting kinetic energy of the sled.

• Increase the mass of the sled.

• all of the above

• Increase the starting height of the sled.

The faster an object moves, the ________ kinetic energy it has. 

• more
• less
• none of the above
• all of the above 

As mass increases, KE ...

• increases
• decreases
• stays the same

Which has a greater impact on KE?

• mass
• velocity