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gcse_forces_massweight

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 — gcse_forces_massweight [2017/11/05 20:41] (current)rheadi created 2017/11/05 20:41 rheadi created 2017/11/05 20:41 rheadi created Line 1: Line 1: + ====== Mass and Weight ====== + + * Mass is how much of you there is.  It is measured in kg and is a scalar.  It does not change from place to place. + * Weight is how hard the force of gravity pulls on you.  It is measured in N (it is a force!) and is a vector.  It does change from place to place. + + ===== Why do we have weight? ===== + + {{ :jennishillmwg.jpg?nolink|}} + * The force of gravity pulls you towards the centre of the Earth. + * On Earth, the gravitational field strength is 10 N/kg. + * This means that for every kg of mass you have, 10 N of force is pulling you towards the centre of the Earth… + * On the Moon the gravitational field strength is only 1.6 N/kg.  The same mass has less weight on the moon than it does on Earth. + * In space there is no gravity.  You are weightless! + + ===== Factors affecting weight ===== + + Your weight is bigger if: + + * You have more mass + * You are in a stronger gravitational field. + + {{ :wmg_triangle.jpg?nolink|}}===== The formula! ===== + + * Weight = mass x gravitational field strength + * Mass = weight divided by gravitational field strength + * Gravitational field strength = weight divided by mass + + + + + 