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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

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

Sun’s 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 earth’s 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 minute…that 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 earth’s 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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