Describe an experiment you could perform to determine the average speed of a toy car rolling down an incline

When an object moves in uniform circular motion, the direction of its acceleration is a) in the same direction as its velocity vector. b) in the opposite direction of its velocity vector c) is directed toward the center of its circular path. d) is directed away from the center of its circular path. e) depends on the speed of the object.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

If forces acting on an object are unbalanced. true or false