Explain how something can be traveling the same speed yet be accelerating at the same time. The object would have to be traveling in a curved path since it is accelerating and acceleration is defined as a change in velocity over a change in time. If the speed was staying the same then the velocity must be changing by altering the direction in which the object was heading. A force is required to do this. Explain the difference between centripetal and centrifugal force.
Centripetal force is an inwardly directed force that causes an object to move in a circular path.
A centrifugal force is a fictitious force made up by people to explain what appears to be happening to the object from the rotating reference frame. State the two equations for centripetal acceleration. State Newton's Law of Universal Gravitation in words and in equation form. Any mass attracts every other mass in the universe proportional to the product of the masses and divided by the square of the distance bewteen them. Both are being pulled by the earth due to the gravitational force.