Differences

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+====== 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

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