Why is the gravitational potential energy of an object 1 meter above the moons surface less than its potential energy 1meter above earths surface?
a. the objects mass is less on the moon
b. the objects weight is more on the moon
c. the objects acceleration due to gravity is less on the moon
d. both a and c

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.