Car tyre treads increase the grip on the road. Name this gripping force.

• gravity

• friction

• air resistance

• water resistance

Friction causes damage to machinery.

Which of the following does NOT reduce friction?

• lubricating with oil

• increasing surface area

• using ball bearings

• using smoother material

Name the TWO forces acting on the parachutist.

• gravity

• friction

• air resistance

• water resistance

Name the form of energy found in food.

• chemical energy

• electrical energy

• elastic potential energy

• kinetic energy

What form of energy is shown by this windmill?

• chemical energy

• electrical energy

• elastic potential energy

• kinetic energy

What form of energy is stored in a taut bow?

• chemical energy

• electrical energy

• elastic potential energy

• kinetic energy

Which statement about the law of conservation of energy is FALSE?

• Energy cannot be created or destroyed.

• Energy can change from one form to another.

• Atoms cannot be created or destroyed.

The diagram shows a swinging pendulum. What form of energy is highest at points A and C?

• kinetic energy

• gravitational potential energy

• elastic potential energy

• chemical energy

Describe the energy transfer that happens when your mobile phone rings.

• chemical energy → electrical energy → sound, light and kinetic energy

• electrical energy → chemical energy → sound, light and kinetic energy

• chemical energy → electrical energy → heat energy

• sound, light and kinetic energy → electrical energy → chemical energy

Describe the energy transfer that happens when you are charging your phone.

• electrical energy → chemical energy

• electrical energy → heat energy

• chemical energy → electrical energy

• sound, light and kinetic energy → electrical energy