Physics - Energy

Question 1

Name three different energy stores.

Answer 1

E.g. thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, nuclear.

Question 2

Give three ways in which energy can be transferred.

Answer 2

E.g. Mechanically, electrically or by heating.

Question 3

What is work done?

Answer 3

Work done is the energy transferred mechanically or electrically.

Question 4

What is meant by a “system”?

Answer 4

A system is an object or a group of objects.

Question 5

Which energy transfers take place when a car is slowed down by applying the brakes?

Answer 5

Kinetic energy -> Thermal Energy

Question 6

Describe the energy transfers that take place when water is heated in an electric kettle.

Answer 6

Electrical Energy -> Thermal Energy (Heating Element) -> Thermal Energy (Water)

Question 7

Describe the energy transfers that take place when a ball is thrown vertically into the air. You must also take into account air resistance.

Answer 7

Kinetic Energy (bottom of flight) -> Gravitational Energy (top of its flight) -> Kinetic Energy (bottom of flight again).

Some energy is also lost as thermal energy when the ball does work against the air resistance.

Question 8

Matthew has a lesson scheduled for 9:30am. What time will he arrive?

Answer 8

9:40am.