Chapter 1 - Energy

Question 1

Name 8 energy stores

Answer 1

Kinetic
Gravitational potential
Elastic potential
Thermal
Chemical
Nuclear
Magnetic
Electrostatic

Question 2

4 ways energy can be transferred

Answer 2

Heating
Waves
Electricity
Forces (mechanical(

Question 3

Work done equation

Answer 3

Force x distance

Question 4

Work done unit

Answer 4

Joules

Question 5

Force unit

Answer 5

Newton

Question 6

Distance unit

Answer 6

Metres

Question 7

An objects gravitational potential energy depends on three things

Answer 7

1. Height above ground
2. Gravitational field strength
3. Mass

Question 8

Gravitational potential energy =

Answer 8

Mass x gravitational field strength x height

Question 9

Mass unit

Answer 9

Kilograms

Question 10

Gravitational field strength unit

Answer 10

N/Kg

Question 11

Kinetic energy depends on 2 things

Answer 11

Mass and speed

Question 12

Kinetic energy =

Answer 12

0.5 x mass x speed squared

Question 13

Speed unit

Answer 13

M/s

Question 14

Elastic potential energy =

Answer 14

0.5 x spring constant x extension squared

Question 15

Spring constant unit

Answer 15

N/m

Question 16

Power is defined as

Answer 16

How work done per second

Question 17

Power unit

Answer 17

Watt

Question 18

1 watt =

Answer 18

1 joule per second

Question 19

Power =

Answer 19

Energy transferred
______________________

Time

Question 20

Lubrication =

Answer 20

Reducing unwanted energy transfer due to friction

Question 21

Streamlining =

Answer 21

A way of reducing energy wasted due to air resistance or drag

Question 22

Efficiency equation =

Answer 22

Useful output energy transfer
________________________________

Total input energy transfer

Question 23

Describe energy transfer when a car slows down

Answer 23

Energy transferred mechanically from kinetic store of the car to the thermal store of the brakes

Question 24

Describe energy transfer when an electric kettle heats water

Answer 24

Electric current in a kettle transfers energy to the heating element’s thermal store.

Energy is then transferred from the heating element to the thermal store of the water

Question 25

Describe the energy transfer when a ball is fired using an elastic band

Answer 25

Energy is transferred mechanically from the elastic store of the band to the kinetic store of the ball

Question 26

Describe the energy transfer when a battery powered toy car is used

Answer 26

Energy transfer is transferred electrically from the chemical store of the battery to the kinetic store of the toy car