When you push a 1.80-kg book resting on a tabletop, it takes 2.25 N to start the book sliding. Once it is sliding, however, it takes only 1.50 N to keep the book moving with constant speed. What are the coefcients of static and kinetic friction between the book and the tabletop?
Lectures 8 nd Dynamics KINEMATICS describes “how” things move, DYNAMICS describes “why” things move Unbalanced Force causes motion to c hange (Δv ) Force → a physical uantity escribing how hard and in what direction acceleration is moving (push or pull) Requires an agent a nd object Is a vector Contact Force Physically touches o bject The agent is exactly what is in contact with the object Long Range Force Not touching (gravity is the only one