Test - energy stores and transfers

Question 1

What is energy transferred between

Answer 1

Stores

Question 2

Name the different types of energy stores

Answer 2

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

Question 3

Energy is transferred…

Answer 3

Mechanically ( by a force doing the work) , electrically( by moving charges), by heating or by radiation eg light or sound

Question 4

What is energy transfer

Answer 4

It is where one type of energy store is transferred or shifted to another

Question 5

What is an exsample of energy transfer

Answer 5

A light bulb

Electrical energy ————>light ( useful out ) heat ( waste out )

Question 6

What a system

Answer 6

A group of interacting objects

Question 7

What is the unit of energy

Answer 7

Joule (J)

Question 8

What happens when a system changes

Answer 8

Energy is transferred
For eg a kettle
The water is the system , energy is transferred to the water by heating so it is transferred to the thermal energy store

Question 9

Explain the changes involved in the way energy is stored when an object is projected upwards

Answer 9

It cause an energy transfer from the chemical energy store ( a persons arm) to the kinetic energy store ( of the ball being thrown upwards )

Question 10

Explain the changes involved in the way energy is stored when a vehicle Is slowing down

Answer 10

Cause energy transfer form the wheels kinetic energy stores to the thermal energy store of its surrounding

Question 11

Describe the changes involved in the way energy is stored when water is boiling in a electric kettle

Answer 11

Energy is transferred electrically to the thermal energy store of the kettle heating element which transferred energy by heating to the waters thermal energy store

Question 12

Explain the changes involved in the way energy is stored when a moving object hits an obstacle

Answer 12

Energy is transferred from the car kinetic energy to other energy stores eg elastic potential and thermal energy stores of an object and might also be transferred by sound wave s

Question 13

Example of kinetic energy

Answer 13

Involves moving object eg Wind mills , cycling , walking and running , flying an airplane, a moving car and a bullet from a gun

Question 14

Examples of elastic potential energy store

Answer 14

Anything stretched eg rubber bands and spring

Question 15

Example of gravitational potential energy store

Answer 15

Anything in a gravitational field / and thing that can fall eg throwing a ball or lifting a book

Question 16

Example of thermal energy store

Answer 16

Everything that has heat in it eg a Bunsen burner

Question 17

Example of chemical energy store

Answer 17

Anything that is released by a chemical reaction eg battery

Question 18

Example of electrostatic energy store

Answer 18

Anything that has two electrical charges that attract or repel each other

Question 19

Finish the equation 
Energy transferred ( in joules ,J) =

Answer 19

= force (in Newton’s , N ) x distance (in meters, m)

Question 20

How would you reduce waste energy transfer

Answer 20

By using lubrication and thermal insulation

Question 21

Describe the energy transfer and identify waste and useful energy
For a kettle

Answer 21

Electrical
Useful - heat
Not useful- sound and heat

Question 22

Describe the energy transfer and identify waste and useful energy
For a hairdryer

Answer 22

Electrical
Useful - heat and kinetic
Not useful - sound and heat

Question 23

Describe the energy transfer and identify waste and useful energy
For a fan

Answer 23

Electrical
Useful - kinetic
Not Useful- sound and heat

Question 24

Describe the energy transfer and identify waste and useful energy
For a radio

Answer 24

Electrical
Useful - sound
Not useful - heat