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True or false? Work is done when an object is moved by a force.

True or false? Work uses a different SI unit to energy.

True or false? Gravitational potential energy is energy stored in an object because of its position in the Earth's gravitational field.

What is the gravitational potential energy of an object of 0.5kg mass if it is lifted by 3m?

1.5J

3J

15J

10.5J

What is the power developed of an object which, when lifted, gains 60J in 10s?

600W

6W

60W

True or false? Kinetic energy is the energy of an object when it is stationary.

True or false? Momentum is a scalar quantity.

True or false? In a closed system, the total momentum before an event is equal to the total momentum after the event.

Trolley A, 6kg, is travelling in one direction at 4m/s. Trolley B, 7kg, is travelling in the other direction at 3m/s. The two trolleys stick together and move off. What is the velocity of the two trolleys?

2.5m/s

3m/s

3.5m/s

4m/s

True or false? In an explosion, the total momentum is zero.

True or false? If, in an explosion, two pieces of debris move apart, they will not move with equal and opposite momentum.

True or false? If the impact time is increased, the impact force will be increased.