centripetal force generalized force centrifugal force gravitational force
I gave my students this multiple choice question: Sir Isaac Newton stated that every object in the universe attracts matter. The attraction depends on the mass of an object and the distance between the objects. What type of force did Newton describe?

Only one answer is correct among these 4 choices:
- centripetal force
- generalized force
- centrifugal force
- gravitational force

Could you tell me which one is correct?

gravitational force