Gravity

• 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 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)