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.
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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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