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June 24, 2010 at 12:43 PM WEIGHT The weight of an object on earth depends on the force of attraction (gravity) between the falling object and Earth. Therefore, weight is a type of force, it has both magnitude and direction. The SI unit for weight is Newton (N). The direction of weight of any object is always towards the centre of the Earth. *Note that weight is NOT MEASURED in Kilogram (kg)! If we let a body mass of m fall, it moves towards the centre of the Earth with an acceleration of g. Now, from the equation force = mass × acceleration, we can see that the body is acted upon by a force of mg towards the centre of the Earth. This force of Earth's gravitational pull on the body is known as its weight. Hence, the expression for weight can be linked to mass by Newton's second law:  Do you know why your weight decrease if you are on the Moon? That is because Moon has a lower garvitational field strength. In fact, you will be 1/6 of your Earth's weight on the Moon! We use a spring balance or a compression balance to measure weight.  A spring balance  A compression balance |
