Question
A child pushes a toy car along a horizontal surface and then releases it.
As the car slows down, what is the main energy transfer?
- from chemical to thermal
- from chemical to kinetic
- from kinetic to gravitational (potential)
- from kinetic to thermal
Answer/Explanation
Ans:
D
Question
Brakes are used to slow down a moving car.
Into which form of energy is most of the kinetic energy converted as the car slows down?
A chemical
B elastic
C thermal
D sound
Answer/Explanation
Ans:C
Question
A stone is released from rest from a high building on Earth. Air resistance is negligible.
What is its velocity when it has fallen 5 m?
A 7.1 m / s B 10 m / s C 50 m / s D 100 m / s
Answer/Explanation
Ans: B
Question
The diagram shows part of a rollercoaster ride with the car at different positions.
The car runs freely down from position X to position Y and up the hill on the other side.
What happens to the kinetic energy and to the gravitational potential energy of the car as it
moves from position X to position Y?
|
kinetic energy |
gravitational potential energy |
|
|
A |
decreases |
decreases |
|
B |
decreases |
increases |
|
C |
increases |
decreases |
|
D |
increases |
increases |
Answer/Explanation
Ans: CQuestion
A ball is at rest at the top of a hill. It rolls down the hill. At the bottom of the hill the ball hits a wall and stops.
Which energy changes occur?
A gravitational potential energy → internal energy → kinetic energy
B gravitational potential energy → kinetic energy → internal energy
C kinetic energy → gravitational potential energy → internal energy
D kinetic energy→ internal energy → gravitational potential energy
Answer/Explanation
Ans: B