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Complete Space Option Topic Notes
Physics
14 Pages • Topic Notes • Year: Pre-2021
1. The Earth has a gravitational field that exerts a force on objects bon it and around it • Define weight as the force on an object due to a gravitational field - A field is essentially a region of influence; objects with specific properties will experience a force in this region. - A gravitational field is the area surrounding a massive object in which another object with mass will experience a force. - Mass refers to the quantity of matter present in an object; an absolute measurement of how much matter is in a body (kg) - Weight is the force which acts on a mass within a gravitational field (N) - The weight force experienced by an object is the gravitational force acting on the object and this force will cause the object to accelerate. F = Force (N) F = Ma M = Mass (kg) A = acceleration (ms-2) • Explain that a change in gravitational potential energy is related to work done - Potential energy is energy which is stored in an object by doing work on that object, against a force and solely depends on position - Gravitational potential energy of an object is the energy that an object possesses due to its position in a gravitational field - Change in energy = work done - When gravitational potential energy increases, work is done on the object When gravitational potential energy decreases, work is done by the object W = work (J) W = Fd F = force (N) W = (mg)d m = mass (kg) W = mgh g = acceleration due to gravity (ms-2) d or h = distance or height (m)
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