Forces and Newton's Laws - Kinetic Friction

Question 1

kinetic friction (f_k)

Answer 1

• force caused by two solid surfaces sliding across each other
• it acts against the velocity, in the opposite direction, and tries to slow the object down
• depends on roughness/unevenness of surface
• depends on how hard the surface presses - normal force n

Question 2

coefficient of friction (μ)

Answer 2

• f = μn