1.1. The gravitational potential at a particular point is given by the equation: 

         V = –$\frac{GM}{r}$ 

Explain what each symbol in the equation represents.

1.2. Explain what is meant by a gravitational equipotential line.

1.3. (i) On Figure 1 below, draw 4 equipotential lines for equal changes in potential around the Earth.

Figure 1

(ii) On Figure 2 below, draw 4 equipotential lines for equal changes in potential above the Earth’s surface.

Figure 2

1.4. State the work done when moving an object along an equipotential line or surface.