Forces and motion Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What is a force

A

The means that causes a mass to change it’s momentum

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

Name seven types of forces

A

Air resistance, water resistance, magnetism, gravity, friction, pressure, weight

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

How are forces measured and in which unit of measurement

A

Newton meter and they are measured in newtons

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

What five things can forces make objects do

A

Speed up, slow down, change direction, turn, change shape

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

What do balanced forces produce

A

No change in movement

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

What do unbalanced forces produce

A

A change in movement

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

Name a kind of frictional force

A

Air resistance

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

What does air resistance do

A

Slows an object down that is moving through the air

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

What does friction do

A

It try’s to stop objects sliding past each other

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

Give 4 good points of friction relating to riding a bike

A

Tyres gripping the road, brakes rubbing on the rim of the wheel so you can stop, gripping the handle bars and the friction of the nuts and bolts to hold the bike together

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

Give 2 bad points of friction relating to riding a bike

A

Air resistance limits top speed and friction wastes energy

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

Describe 2 ways of reducing friction

A

Smoothen the surface and add a lubricant

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

Explain the difference between mass and weight

A

Mass is the amount of matter in an object, it will always stay the same anywhere. Weight is a type of force caused by the pull of gravity

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

Can an objects mass be different to its weight

A

Yes it can

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

What is the equation to calculate weight

A

Weight=mass x gravitational field strength

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

What is Stretching

A

Stretching is distortion which happens when a force acts on an object which cannot move or when several forces act in different directions

17
Q

Give an example of a permanent stretch

A

Clay

18
Q

Give an example of a temporary stretch

A

Elastic band

19
Q

What is Hooke’s law of elasticity

A

The amount of stretch is directly proportional to the force acting on it