Work, Power And Energy

Question 0

Units for force

Answer 0

Newtons

Question 1

Work

Answer 1

Work = force x distance

Question 2

Unit for work

Answer 2

Joules

Question 3

The unit for power

Answer 3

Watt

Question 4

Power

Answer 4

Work done/time taken

Question 5

Work (sentence)

Answer 5

Applying force in an object moving a particular distance

Question 6

Power (word)

Answer 6

The rate at which work is done

Question 7

Energy (word)

Answer 7

The ability to do work

Question 8

Unit for energy

Answer 8

Joule

Question 9

Kinetic energy

Answer 9

Moving objects e.g car moving

Question 10

Potential energy

Answer 10

Changing shape or position of a object e.g wind up a clock you tighten the spring

Question 11

Sound energy

Answer 11

When a sound is made e.g strumming a guitar

Question 12

Heat energy

Answer 12

It causes movement e.g some water in the kettle evaporates

Question 13

Chemical energy

Answer 13

It causes movement but isn’t as obvious e.g food contains chemicals it causes us to move

Question 14

Electrical energy

Answer 14

A good example of a form of energy causing movement e.g electric cars has powerful motors

Question 15

Magnetic energy

Answer 15

Magnets that causes movement e.g magnets used in scrap yards to lift metal like cars

Question 16

Solar energy

Answer 16

Is taken from the rays of the sun it is converts solar energy into electrical energy using solar cells.solar panels

Question 17

Nuclear energy

Answer 17

In nuclear fission the nucleus is split releaseing energy

Question 18

The principle of conservation of energy

Answer 18

The fact energy is never used up, it changes into another form of energy

Question 19

Groups of energy sources

Answer 19

Non-renewable sources of energy

Renewable sources of energy

Question 20

Non renewable sources of energy

Answer 20

Oil, coal, gas, turf

Question 21

Advantages of non-renewable sources of energy

Answer 21

Easy to get

Reasonably cheap

Question 22

Disadvantages of non renewable sources of energy

Answer 22

Causes greenhouse gas emissions

Polluting the atmosphere

Question 23

Sources of renewable energy

Answer 23

Solar energy
Hydro-electricity
Wind energy
Nuclear energy

Question 24

Advantages of solar energy

Answer 24

It is free

It doesn’t cause pollution

Question 25

Disavantages of solar energy

Answer 25

A small percentage of of the solar energy is converted to electrical energy
Solar cells are expensive to make

Question 26

Hydro electricity

Answer 26

Water behind a dam wall has potential energy it is turned to kinetic energy once it is released and changes to electrical energy

Question 27

Advantages of hydro-electricity

Answer 27

Does not cause pollution

Cost efficient way to produce energy

Question 28

Disasvantages of hydro electricity

Answer 28

Flooding can cause damage in animals and plant habitats

Dams can cause flooding in valleys inhabited by people

Question 29

Wind energy

Answer 29

Moving air causes kinetic energy and converts to electrical energy

Question 30

Advantages of wind energy

Answer 30

Doesn’t cause pollution

Wind energy is free

Question 31

Disadvantages of wind energy

Answer 31

Large propeller masts destroys the natural beauty and is very noisy
No energy can be produced in a calm day