Question 1

The transfer which involves a temperature difference

Accepted Answer

Heating

Answer

Mechanical

Answer

Radiation

Answer

Electrical

Question 2

Chemical store of energy

Accepted Answer

Energy stored within bonds e.g. batteries, food and fuel.

Answer

Stretched / compressed objects

Answer

Moving objects

Answer

Objects at a height above the ground

Question 3

Kinetic store of energy

Accepted Answer

Moving objects

Answer

Energy stored within bonds e.g. batteries, food and fuel.

Answer

Objects at a height above the ground

Answer

Stretched / compressed objects

Question 4

Gravitational potential store of energy

Accepted Answer

Objects at a height above the ground

Answer

Energy stored within bonds e.g. batteries, food and fuel.

Answer

Moving objects

Answer

Stretched / compressed objects

Question 5

Elastic potential store of energy

Accepted Answer

Stretched / compressed objects

Answer

Moving objects

Answer

Objects at a height above the ground

Answer

Energy stored within bonds e.g. batteries, food and fuel.

Question 6

Magnetic store of energy

Accepted Answer

Between separated magnets

Answer

Between separated charges

Answer

Within a nucleus released by radioactive decay and fission or fusion

Question 7

Electrostatic store of energy

Accepted Answer

Between separated charges

Answer

Between separated magnets

Answer

Within a nucleus released by radioactive decay and fission or fusion

Question 8

Nuclear  store of energy

Accepted Answer

Within a nucleus released by radioactive decay and fission or fusion

Answer

Mechanical

Answer

Radiation

Answer

Electrical

Question 9

Thermal  store of energy

Accepted Answer

Energy store when there is a temperature difference

Answer

Radiation

Answer

Electrical

Answer

Mechanical

Question 10

The transfer which involves a force moving by a distance

Accepted Answer

Mechanical

Answer

Electrical

Answer

Heating

Answer

Radiation

Question 11

The transfer which involves a charge moving across a potential difference

Accepted Answer

Electrical

Answer

Heating

Answer

Radiation

Answer

Mechanical

Question 12

The transfer which involves a wave such as light, sound

Accepted Answer

Radiation

Answer

Electrical

Answer

Mechanical

Answer

Heating

Question 13

What does the law of conservation of energy state?

Accepted Answer

Energy cannot be created or destroyed only transferred.

Answer

Energy cann be created or destroyed only transferred.

Question 14

What is a system?

Accepted Answer

an object or group of objects

Answer

a complex machine

Question 15

What is a closed system?

Accepted Answer

A system in which energy cannot be added or removed from it.

Answer

A system in which energy can be transferred from and to the environment.

Question 16

What is an open system?

Accepted Answer

A system in which energy can be transferred from and to the environment.

Answer

A system in which energy cannot be added or removed from it.

Question 17

Work done =

Accepted Answer

force x distance

Answer

force / distance

Question 18

When does work have to be done against friction?

Accepted Answer

brake pads, moving parts in machines, air resistance

Answer

Energy is transferred to thermal energy stores by heating.

Question 19

What type of work is done to overcome friction?

Accepted Answer

Energy is transferred to thermal energy stores by heating.

Answer

brake pads, moving parts in machines, air resistance

Question 20

What is weight?

Accepted Answer

the force of gravity on an object - N

Answer

the matter which makes up an object - kg

Question 21

What is mass?

Accepted Answer

the matter which makes up an object - kg

Answer

the force of gravity on an object - N

Question 22

how to convert weight into mass?

Accepted Answer

weight / 9.8

Answer

weight x 9.8

Question 23

how to convert mass into weight?

Accepted Answer

mass x 9.8

Answer

mass / 9.8

Question 24

how do you calculate the change in kinetic  energy?

Accepted Answer

0.5 x mass x velocity squared

Answer

mass x gravitational field strength x height

Answer

mass x gravitational field strength x height squared

Answer

0.5 x mass x velocity

Question 25

how do you calculate the change in gravitational potential energy?

Accepted Answer

mass (kg)  x gravitational field strength x height

Answer

0.5 x mass (kg) x velocity squared

Answer

mass (kg)  x gravitational field strength x height squared

Answer

0.5 x mass (kg) x velocity

Question 26

How to calculate change in elastic potential energy?

Accepted Answer

0.5 x spring constant x extension squared

Answer

0.5 x spring constant x extension

Question 27

How is energy mostly dissipated (spread out) to the surroundings?

Accepted Answer

heating, radiation (sound)

Answer

heating, radiation (light)

Question 28

how to reduce friction?

Accepted Answer

use a lubricant

Answer

use newer parts in machines

Question 29

how to calculate the efficiency of a device?

Accepted Answer

useful output energy / input energy x 100

Answer

useful input energy / output energy x 100

Question 30

which of the following is not a way in which devices waste energy?

Accepted Answer

the device becomes too big with time

Answer

sound created by machinery - reduce by tightening loose parts to reduce vibration

Answer

friction between moving parts causes heating - reduced by lubricating

Answer

resistance of a wire causing the wire to get hot - reduced by using wires with little electrical resistance

Question 31

which of the following is not a way in which devices waste energy?

Accepted Answer

the device malfunctions causing erratic movement

Answer

moving object experiences air resistance, reduce by streamlining

Answer

resistance of a wire causing the wire to get hot - reduced by using wires with little electrical resistance

Answer

friction between moving parts causes heating - reduced by lubricating

Question 32

what is the energy transfer in a phone?

Accepted Answer

chemical energy (battery) to radiation (light and sound)

Answer

electrical energy to light

Question 33

what is power?

Accepted Answer

the rate at which energy is transferred

Answer

how quick energy is made

Question 34

power =

Accepted Answer

work done  / time

Answer

work done x time

Question 35

power =

Accepted Answer

energy transferred / time

Answer

energy transferred x time

Question 36

efficiency =

Accepted Answer

useful power out / total power in x 100

Answer

useful power in  / total power out x 100

Question 37

units for power

Accepted Answer

Watts (W)

Answer

Energy (J)

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