fields and forces summary - IB PHYSICS SUBSIDIARY LEVEL...

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IB PHYSICS SUBSIDIARY LEVEL FIELDS AND FORCES SUMMARY 6.1 Gravitational force and field (2h) The forces of attraction between two masses are along the line between their centres and equal size and opposite directions. The forces equal big G times mass one times mass two divided by the square of the distance between their centres. The force of gravity is an inverse square law with distance. At twice the distance the force is one quarter as much. The gravitational field at a point is the resultant gravitational force that 1 kg would receive. The gravitational field near a mass equals big G times the mass divided by the distance squared from the centre. The gravitational field on the surface of a mass equals big G times the mass divided by the radius square. 6.2 Electric force and field (3h) The two types of charge are positive on protons and negative on electrons. During charging by friction, electrons are rubbed off one object leaving it excess positive and onto another object leaving it excess negative.
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