Unit 1- Energy

Question 1

Work done equation

Answer 1

Force x distance

Question 2

Kinetic energy equation

Answer 2

Half x mass x velocity squared

Question 3

Power equation

Answer 3

Energy /time

Question 4

Conduction

Answer 4

Occurs in solids, vibrating particles transfer energy to neighbouring particles

Question 5

Convection

Answer 5

In liquids and gases, where particles move away from hotter to cooler regions

Question 6

Efficiency equation

Answer 6

Useful output energy/ total input energy

Question 7

What is geothermal energy

Answer 7

Underground thermal stores

Question 8

What is hydroelectric power

Answer 8

Power transfers energy from kinetic store if falling water

Question 9

Whst are biofuels

Answer 9

Renewable energy resources created from plants or animals

Question 10

Gravitational potential equation

Answer 10

Mass x height x gravitational field strength

Question 11

What is specific heat capacity

Answer 11

Amount of energy needed to raise temperature of 1kg of a substance by 1 degrees

Question 12

Equation linking power current and resistance

Answer 12

Power = current squared x resistance

Question 13

Equation linking energy charge and potential difference

Answer 13

Energy = charge x potential difference

Question 14

Equation linking current potential difference and power

Answer 14

Power = current x potential difference

Question 15

Equation linking power, time and work done

Answer 15

Power = work done / time

Question 16

As the cyclist rides along the road what energy store decreases

Answer 16

Chemical

Question 17

How does cycling uphill affect maximum speed of cyclist

Answer 17

Maximum speed is lower
Maximum force on pedals is constant
But gpe will increase

Question 18

What does more energy efficient mean

Answer 18

Higher proportion of total input power is usefully transferred

Question 19

Name the energy stores

Answer 19

Thermal , gravitational energy, magnetic, elastic potential, kinetic, nuclear, chemical, electrostatic

Question 20

How can energy stores be transferred

Answer 20

By heat, mechanically, electrically, light, sound

Question 21

Movement of gases

Answer 21

-random directions
-random speeds

Question 22

What is the tiny spheres model

Answer 22

Came about before the discovery of the electron

Question 23

Solid to gas

Answer 23

Sublimation

Question 24

Advantages of nuclear power

Answer 24

Extremely reliable, no carbon dioxide produced therefore doesn’t contribute to climate change

Question 25

What is thermal conductivity

Answer 25

Higher thermal conductivity, the higher the rate of energy transfer by conduction across that material

Question 26

How to reduce thermal energy transfer from house

Answer 26

Construct building using materials with low thermal conductivity
Build house with thick walls as this reduces thermal energy transfer

Question 27

What is work done

Answer 27

Whenever energy is transferred from one store to another

Question 28

What happens when car brakes

Answer 28

Moving with kinetic energy and then brake presses against wheel of the car which causes friction, the kinetic energy store transfers to thermal energy store, this temp of breaks slows down car and stops it

Question 29

What is a zero error

Answer 29

measuring system gives a false reading when the true value of a measured quantity is zero