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Transcript
1. Fields and Forces 1.1. Gravitational force and fields 1.1.1. State Newtonβs universal law of gravitation Newtonβs universal law of gravitational: Every single point mass attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of their separation. πΉ=πΊ ππ π2 Where: F= force exerted G= gravitational field constant M= mass of object A m= mass of object B r= distance between the 2 objects 1.1.2. Define gravitational field strength Gravitational field: as regions of space where a mass experiences a force because of its mass. Gravitational field strength: as the force per unit mass experienced by a small test mass placed in the field. πΉ π= π Where: g= gravitational field strength F= Force m= mass 1.1.3. Determine the gravitational field due to one or more point masses Field lines: are drawn in the direction that a mass would accelerate if placed in the field. Field strength (g): is given by the density of the lines. 1.1.4. Device an expression for gravitational field strength at the surface of a planet, assuming that all its mass its mass is concentrated at its centre. If: πΉ π= π And: ππ πΉ=πΊ 2 π Then: ππ = πΉ Therefore: ππ ππ = πΊ 2 π Therefore: π π=πΊ 2 π