physics exam revision

Question 1

What are joules?

Answer 1

The unit for energy

Question 2

What are watts?

Answer 2

The unit for power

Question 3

What is one joule of energy equivalent to?

Answer 3

Joule of energy = watts of power x seconds of time

And lifting an apple

Question 4

What does power tell us?

Answer 4

how many joules of energy something uses or produces each second

Question 5

What’s the formula for joules and watts?

Answer 5

Joules = watts of power x seconds of time

Watts = joules of energy divide seconds of time

Question 6

What are the different types of energy we give?

Answer 6

Thermal energy, sound energy, light energy, nuclear energy, kinetic energy,

elastic potential energy, gravitational potential energy, chemical potential energy and electrical energy

Question 7

*know how to draw flow diagrams showing simple energy transformations

Answer 7

.

Question 8

know how to draw series and parallel electrical circuits ep

Answer 8

Including batteries, globes, voltmeter and ammeter using correct symbols

Question 9

What is the difference between an ammeter and a voltmeter?

Answer 9

An ammeter measure the flow of current whereas the voltmeter measures the voltage across any two points of the electrical circuit.

Question 10

What are the different types of wave we have?

Answer 10

Transversal wave - a wave that wobbles the medium from side or side or up and down

Longitude - a wave the wobbles the medium backwards and forwards

Question 11

What are the different media sound can travel through?

Answer 11

Sound can travel through anything that has a medium. Eg water, air, wood etc

Question 12

Speed formula:

Answer 12

Speed = distance divide time = d/t

Question 13

What is a rarefaction and compression regarding a sound wave?

Answer 13

Rarefaction = a region in a longitudinal wave where the particles are furthest apart

Compression = a region in a longitudinal wave where the particles are closest together

Question 14

know how to label Low and high frequency sound waves (ep)

Answer 14

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Question 15

What are the units for sound and frequency of sound?

Answer 15

the unit for sound is decibel (dB) and the unit for sound frequency is hertz (Hz)

Question 16

*be able to draw and label the different parts of the ear

Answer 16

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Question 17

What is a medium?

Answer 17

Anything that contains particles.

Question 18

Frequency, wavelength and amplitude:

Answer 18

The frequency of a wave is caused by the number of vibrations a noise makes each second

Wavelength is low long a wave is (unit meters)

Amplitude is the maximum displacement or distance moved by a point on a vibrating body or wave

Question 19

High frequency and low frequency sound waves:

Answer 19

High frequency = compressions are bunched closer together and have a short wavelength

Low frequency = compressions are spread out and have a long wavelength

Question 20

What is energy?

Answer 20

If something has energy, we can see that it is active and that it can do things and make things happen

Question 21

What is power?

Answer 21

The rate of doing work or transferring heat, the amount of energy transferred or converted per unit time.

Question 22

What is voltage?

Answer 22

the measure of the amount of electrical energy gained or lost by electric charge as it moves through the circuit. It is also known as potential difference

Question 23

What is current?

Answer 23

the measure of the amount of electric charge / electrons passing a point in an electric circuit.