Physics Test (Year 8) Flashcards

1
Q

How do you calculate power?

A

power (w) =

energy (j)
________
time (s)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How do you calculate the work done?

A

work done (j) =

force (N) x distance (m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does the speed, distance, time triangle look like?

A

/ D \
/ S | T \
______

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How do you calculate pressure?

A

pressure (N/m²) =

force (N)
________
area (m²)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How do you calculate the moment (turning force)?

A

moment (Nm) =

force (N) x distance from pivot (m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How do you calculate current?

A

current (A) =

potential difference (v)
_________________
resistance (Ω)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How do you calculate resistance?

A

resistance (Ω) =

potential difference (v)
_________________
current (A)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What does the resistance, potential difference and current triangle look like?

A

/ V \
/ A | R \
______

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

You are driving a car at 60mph. Another car is travelling in the same direction as you at the same speed.
What is the relative speed?

A

0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Two cars are moving at each other at 30mph.

What is the relative speed?

A

60mph

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What charge do protons have?

A

Positive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What charge do electrons have?

A

Negative

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What charge do neutrons have?

A

They have no charge.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is an electric field?

A

A region where a charged material or particle experiences a force.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is potential difference?

A

A measure of the push of a cell or battery, or the energy that the cell or battery can supply.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How can energy be transferred?

A

Through:
Conduction
Convection
Radiation

17
Q

What is conduction?

A

The way in which energy is transferred through solids, and to a much lesser extent in liquids and gases.

18
Q

What is convection?

A

The transfer of energy by the movement of heated liquids or gasses.

19
Q

What is radiation?

A

The transfer of energy as a wave.

20
Q

What happens when you heat a solid?

A

The particles vibrate more.

21
Q

What happens when you heat a liquid or a gas?

A

The particles move faster and vibrate more.

22
Q

Explain the law of conservation of energy.

A

Energy cannot be created or destroyed, only transferred.

23
Q

Explain the law of moments.

A

An object is in equilibrium if the clockwise moments equal the anticlockwise moments.

24
Q

What piece of equipment is used to measure potential difference?

25
In a series circuit which is the same for each component?
Current
26
How can you increase the strength of an electromagnet?
Increase the current Increase the number of turns Add an iron core
27
Define current.
Current is the flow of charge.
28
What piece of equipment is used to measure current?
Ammeter
29
Define potential difference.
A measure of the push of a cell or battery or the energy that the cell can supply.
30
Give the unit for potential difference.
Volts | v
31
Give the unit for current.
Amperes or Amps. | A
32
What pieces of equipment would you need to investigate a magnetic field?
A bar magnet, plotting compasses or iron filings and some paper.
33
How do you calculate the relative motion/velocity?
Object A speed - Object B speed
34
How do you calculate the relative motion/velocity if the objects are travelling in opposite directions?
Object A speed - (-Object B speed)