- Weight is the force acting on an object due to gravity. The force of gravity close to the Earth is due to the gravitational field around the Earth.
- The weight of an object depends on the gravitational field strength at the point where the object is
The weight of an object can be calculated using the equation:
weight = mass × gravitational field strengthW =mg
weight, W, in newtons, N mass, m, in kilograms, kg
gravitational field strength, g, in newtons per kilogram, N/kg (In any calculation the value of the gravitational field strength (g) will be given.)
The weight of an object may be considered to act at a single point referred to as the object’s ‘centre of mass’.
The weight of an object and the mass of an object are directly proportional.
Weight is measured using a calibrated spring-balance (a newtonmeter).
MS 3a-Understand the symbols: = < << >> >∝~
MS 3b Change the subject of an equation
MS 3c Substitute numerical values into algebraic equations using appropriate units for physical quantities
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