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Mass Force and Gravity
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Slide 1

Mass, Force and Gravity

Mass, Force and Gravity

Mass Amount of stuff (atoms/molecules) in an object. Measured in kg.

Force Measures the gravitational pull on something. Measured in N (newtons)

Earths Gravitational Field Strength 10N/kg. (The gravitational field strength at the surface of the Earth produces a force of approximately 10 N on every mass of 1 kg)

Slide 2

Gravitational field

Gravitational field

Earths gravitational force makes the ball move down towards the centre of the Earth.

Suns gravitational force makes the Earth move in an orbit around the Sun.

Slide 3

Putting it all together

Putting it all together

The apple has mass (kg)

It gets pulled to the ground at a force (this can be measured in Newtons)

The earths gravitational field strength pulls the apple towards it

Slide 4

Now

Now

Weight Is a measure of force pulling something to the ground due to gravity

Hang on a minutethat sounds very familiar

Slide 5

Weight = Force

Weight = Force

Weight is measured in N (newtons)

Slide 6

Putting it all together

Putting it all together

The apple has mass (kg)

It gets pulled to the ground at a force (this can be measured in Newtons) = WEIGHT

The earths gravitational field strength pulls the apple towards it

Slide 7

How can we calculate weight?

How can we calculate weight?

We can use an equation we already know to help us:

g (gravitational field strength) = force / mass

If Force = Weight

Weight = Mass x g (gravitational field strength)

Memorise: W = m X g

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