Mass, Force and Gravity Mass – Amount of stuff (atoms/molecules) in an object. Measured in kg. Force – Measures the gravitational pull on something. Measured.

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Presentation transcript:

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)

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.

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

Now… Weight – Is a measure of force pulling something to the ground due to gravity Hang on a minute…that sounds very familiar…

Weight = Force Weight is measured in N (newtons)

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

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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