The motions of a pendulum and a planet undergoing circular motion are compared. a. describe the simularity in their motions b. describe a difference in there motions. c. Outline a difference in the force(s) acting on the pendulum and the planet. this is kind of a stupid question and i have no idea where to even start. the only thing i can think of is that both the pendulum and planet are having the force of gravity some how workin around them. if you can help thanks a bunch!