Year 9 Energy

Question 1

What is energy ?

Answer 1

Energy is the ability to do work

Question 2

Name eight energy stores

Answer 2

Chemical, kinetic, gpe, thermal, elastic potential, magnetic, electrostatic, nuclear

Question 3

What are three types of fossil fuels ?

Answer 3

Coal, oil and gas

Question 4

What must you always have when writing an energy transfer ?

Answer 4

An arrow and at least one energy on each side

Question 5

Why can efficiency never be 100% ?

Answer 5

There is always wasted energy

Question 6

Why can’t you have an efficiency of over 100% ?

Answer 6

As stated in the law of conservation of energy you can’t create energy

Question 7

What is the calculation to find efficiency?

Answer 7

Useful energy/ total energy

Question 8

How many n/kg is gravity ?

Answer 8

10n/kg

Question 9

What is power ?

Answer 9

The rate of transferring energy or doing energy

Question 10

What is power measured in ?

Answer 10

Watts

Question 11

How do you calculate the power ?

Answer 11

Energy/time or work/time

Question 12

What is in the law of conservation of energy?

Answer 12

Cannot create energy, cannot destroy energy and can transfer between stores

Question 13

What is energy measured in ?

Answer 13

Joules

Question 14

What is drag ?

Answer 14

It’s the type of friction in the air

Question 15

Are energy transfers efficient or inefficient ?

Answer 15

Inefficient

Question 16

What does balance forces mean ?

Answer 16

Constant speed

Question 17

How do you calculate work ?

Answer 17

Force x distance moved in direction of force

Question 18

What happens to the kinetic energy you have as you speed up ?

Answer 18

You get more kinetic energy

Question 19

How do you calculate the gain in gravitational potential ?

Answer 19

Ep = mgh

Question 20

How do you calculate velocity?

Answer 20

V = square root (2Ek/m)

Question 21

How do you calculate power ?

Answer 21

P = E/T

Question 22

How do you calculate energy ?

Answer 22

E = PT

Question 23

How do you calculate time ?

Answer 23

T = e/p

Question 24

How do you calculate mass ?

Answer 24

M = Ep/gh

Question 25

How do you calculate height ?

Answer 25

H = Ep/gm

Question 26

How do you calculate kinetic energy ?

Answer 26

Ek = 1/2 mv^2

Question 27

How do you calculate mass ?

Answer 27

Ek/1/2v2

Question 28

Is geothermal power renewable?

Answer 28

Renewable

Question 29

Is biofuels renewable?

Answer 29

Renewable

Question 30

Is wave power renewable?

Answer 30

Renewable

Question 31

Is tidal power renewable?

Answer 31

Renewable

Question 32

Is hydroelectric power renewable?

Answer 32

Renewable

Question 33

Are fossil fuels renewable?

Answer 33

Non-renewable

Question 34

Is nuclear power renewable?

Answer 34

Non-renewable

Question 35

Is solar power renewable?

Answer 35

Renewable

Question 36

Is wind power renewable?

Answer 36

Renewable

Question 37

How does fossil fuel power work ?

Answer 37

Coal is crushed to a fine dust - burn fuel - heat water for steam - turn turbines - turn generators - electrical power

Question 38

How does nuclear power work ?

Answer 38

Nuclear fission - heat water for steam - turns turbines - turn generators - electrical power

Question 39

How does wind power work ?

Answer 39

The wind blows into the turbines to turn them and that powers a generator to make electrical energy

Question 40

How does solar power work ?

Answer 40

Solar panels capture energy from the sun and convert it into electricity and heat