A block of mass m slides on a frictionless horizontal surface when it encounters a wedge of mass 2m and height h (see the diagram). The wedge also free to slide on the frictionless table. 2m m Consider three moments in time: t - when the block is on the table, before sliding up the wedge; t2 - when the block is at the top of the wedge; t3 - when the block is on the table, after sliding down the wedge. Part 1: The speed of the wedge is a. The greatest at t3 b. Zero at both t, and t3 c. The same but not zero at both t, and t3 d. Zero at t2 Part 2: My answer to part 1 is justified because a. The momentum of the wedge-and-block system is conserved. b. The momentum of the wedge-and-block system is not conserved. c. The mass of the wedge is greater than the mass of the block. d. The block has zero velocity relative to the table when it reaches the top of the wedge.

A skater of mass m standing on ice throws a stone of mass M with speed v in a horizontal direction. Find the distance over which the skater will move in the opposite direction if the coefficient of kinetic friction between the skater and the ice is  ?k . (Use any variable or symbol stated above along with the following as necessary: g.)Δx =

A baseball player initially running 8.94 m/s slides 5.26 m to a stop at home plate. What is the coefficient of kinetic friction between his uniform and the ground? Equations: vf2 = vi2 + 2×a×Dx                           F = ma                   fk = mkN                 N = Fg = mg

At Ted's request, Bill pushes the pizza box across the granite countertop towards Ted. When the box leaves Bill's hand it is sliding at 2.60 m/s. The box comes to rest over a distance of 110 cm. What is the coefficient of kinetic friction, uk, between the pizza box and the countertop? (Ignore air drag.)

A car is traveling at 15 m/s on a horizontal road. The brakes are applied and the car skids to a stop in 4.0 s. The coefficient of kinetic friction between the tires and road is: Friction Road Direction of travel