# Physics- Forces

Forces

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• Created by: emuppet
• Created on: 17-05-14 16:23
What is mass and how is it measured?
Mass is how much 'stuff' is inside something. It is measured in g or kg.
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What is density? What's it measured in? How can we find it?
Density is the space that mass occupies. It is measured in g per cm cubed or kg per m cubed. To find it you have to do mass divided by volume.
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What is the density of a rock that has a mass of 27 kg and a volume of 0.01 m cubed?
2700 m cubed/kg.
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How do you find volume?
Mass divided by density.
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What can forces do?
Push or pull an object, speed things up, slow things down, change direction or shape etc.
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Forces are measured in what unit?
Newtons.
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What is gravity?
A non-contact force that pulls objects down to the ground.
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What is air resistance?
A contact force that slows things down when moving through the air.
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What is friction?
A contact force that happens when you have two surfaces in contact with eachother, and they can slow each other down. the rougher the surface is the more friction.
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Emily is climbing. Where does she need high friction?
In her shoes to stop her from slipping and from falling.
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Swimmers can reduce their drag by...
wearing close fitting costumes so they are streamlined.
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What is weight? How can it be found?
It's the force of gravity acting on an object. It's measured in newtons. Weight= mass(kg) times gravitational pull.
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What is gravitational field strength?(g) Can it change? How do you find it?
The strength of gravity at a particular point, measured in newtons er kilogram ( N/kg). It can change because the further away from the centre of the Earth, the weaker the gravitational field. G= weight divided by mass.
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What is a force that tries to push an object up in the water?
Upthrust.
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How do you find speed?
Distance divided by time.
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Time?
Distance divided by speed.
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Distance?
Speed times time.
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How can you tell on a graph, that an object is not moving?
There would just be a straight line going across it.
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How can you tell if an object is at constant speed?
There would be a line going diagonally upwards.
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What does this mean: 60 miles/h
travels 60 miles in each hour.
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Two forces are trying to make a cyclist slow down. They are...
Friction and air resistance.
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If upthrust and gravity are equal to each other on an object, what would the olect do?
It would stay the same because it's a balanced force.
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If an object is accelerating or slowing down, the forces will be...
unbalanced.
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What f is used to measure force?
force meter.
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## Other cards in this set

### Card 2

#### Front

What is density? What's it measured in? How can we find it?

#### Back

Density is the space that mass occupies. It is measured in g per cm cubed or kg per m cubed. To find it you have to do mass divided by volume.

### Card 3

#### Front

What is the density of a rock that has a mass of 27 kg and a volume of 0.01 m cubed?

### Card 4

#### Front

How do you find volume?

### Card 5

#### Front

What can forces do?