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Fields, Electricity - Coggle Diagram
Fields
Gravitational fields
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The strength of a gravitational field, g, is the force per unit mass on a small test mass placed in a field
A radial field is where the field lines are like the spokes of a wheel, always directed to the centre
A uniform field is where the gravitational field strength is the same magnitude in all direction throughout the field
Gravitational potential energy is the energy of an object due to its position in a gravitational field. The position for zero gpe is at infinity so it has to travel completely outside the field until its force is negligible
At the surface of earth, gpe is negative on an object so it has to do work to escape the field and to get zero gpe
The gravitational potential, V, at a point in a gravitational field is the work done per unit mass to move a small object from infinity to that point.
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The escape velocity from a planet is the minimum velocity an object must be given to escape from the planet when projected vertically from the surface
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Electricity
Current and charge
To make an electric current pass round a circuit, the circuit must be complete.