# p21 - pulls the apple towards it Now… • Weight – Is a...

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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)

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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

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Unformatted text preview: 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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## This note was uploaded on 02/12/2011 for the course PHY 2004 taught by Professor Staff during the Spring '08 term at University of Florida.

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p21 - pulls the apple towards it Now… • Weight – Is a...

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