Question
A student suggests that there are several ways of transferring energy to a small, stationary block of iron on a smooth table. He makes the following suggestions.
Heat it.
Shine light on it.
Pass a current through it.
Which suggestions are correct?
A 1 and 2 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3
Answer/Explanation
Ans: D
Question
Two men, X and Y, try to move identical heavy boxes, P and Q.
Man X tries to push box P along the floor. The box does not move because an object is in the way.
Man Y lifts box Q from the floor onto a shelf.
Which man does the most work on their box, and which box gains the most energy?
| man doing most work | box gaining most energy |
A | X | P |
B | X | Q |
C | Y | P |
D | Y | Q |
Answer/Explanation
Ans: D
Question
A ball is released from rest and rolls down a track from the position shown.
What is the furthest position that it is possible for the ball to reach?
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: C
Question
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
When the ball is present at the top of hill