Revision 2 - Energy, Electricity & Wave

What type of energy is possessed by a stretched rubber band?

What is the energy conversion in the brakes when a moving car slows down during braking?

• chemical potential energy to thermal energy

• kinetic energy to elastic potential energy

• kinetic energy to thermal energy

• thermal energy to kinetic energy

Which action does not involve any conversion of energy?

• a plate resting at the edge of a table

• a speaker at full volume resting on a table

• a spinning ball

• a stationary train flashing its lights

Which device is capable of transforming electrical energy into light, sound, kinetic and thermal energy?

• computer keyboard

• mobile phone

• portable battery

• torchlight

The unit for frequency is .................... (Hz).

What does the wave transfer as it moves in the direction of wave motion?

• air

• energy

• matter

• particle

Which electromagnetic wave allows plants to carry out photosynthesis?

Which wave has the lowest frequency in the electromagnetic spectrum?

Friction is a force that

• causes an object to move faster.

• changes the mass of an object.

• changes the weight of an object.

• opposes the motion of an object.

Which situation shows that friction is useful?

• a car engine that has parts that are in contact with each other

• a car trying to slow down before a red light

• a fighter jet trying to increase its speed

• a person skiing down a mountain slope