Revision - Energy & its Uses & Effects of Forces

Figure 1 shows a student using a slingshot (catapult).

Which form of energy is possessed by the slingshot before it is released?

• Chemical potential energy

• Elastic potential energy

• Gravitational potential energy

• Kinetic energy

Which of the following statements about energy is correct?

• Energy cannot be created or destroyed.

• Energy is created from the burning of fossil fuels.

• Energy is the rate at which work is done.

• The sun is the only source of energy in the Solar System.

The diagram shows a swinging pendulum. At which position does the pendulum bob have the maximum amount of kinetic energy?

• 1

• 2

• 3

• 4

When a spring is compressed, work is done on it. What happens to its elastic potential energy?

• Decreases

• Decreases to zero

• Increases

• Remains the same

A ball is moving at constant speed. In which situation will it move faster?

• A force acts on it in the direction of its motion.

• A force acts on it in the opposite direction of its motion.

• A force presses down on it.

• No force acts on it.

Which of the following is a way to reduce the turning effect of a force?

• Increase the distance of the applied force from the pivot.

• Increase the magnitude of the applied force.

• Move the pivot further away from the applied force.

• Move the pivot nearer to the applied force.

Several types of energy sources have negative impacts on the environment. Which of the following is an impact of burning fossil fuels on the environment?

• Flooding in large areas of forest.

• Production of greenhouse gases and acid rain.

• Production of low-frequency noise.

• Sinking of land.

The diagram below shows an iron bar placed over a small rock in order to move a big rock. At which position on the iron bar should you grip to move the big rock with the least effort?

• A

• B

• C

• D

The diagram below shows two students, Paul and Peter, pulling on an object, W, which lies on a smooth base.

• The object, W, will move to the left.

• The object, W, will move to the right.

• The object, W, will not move.

• The object, W, will slip unpredictably because of the smooth base.

Acceleration is the rate of change of ____________ for an object moving in a fixed direction.

• distance

• speed

• time

• volume