Assignment Questions

1. A workman pushes a 15-kg package along a floor with a force of 60 N. The force is applied at an angle of 20 to floor. If the coefficient of kinetic friction is 0.35 calculate

• the acceleration of the package
• the magnitude of the upward force F_N exerted by the floor on the package

2. A student throws a wooden block at 18 m/s from the roof of a school. If the block hits the ground 24 m from the base of the building and the initial velocity was horizontal to the roof, how high was the block from the ground when it was thrown?

3. While travelling down a level lane a truck slows to a stop at -5.5m/s² without skidding. Assuming the same friction force, what would it's deceleration be if the lane had an incline of 15?

4. A student sets up two blocks, A and B, which are connected by a rope running over a pulley as shown in the diagram below. Block A has a mass of 5.0 kg and block B has a mass of 2.0 kg. The coefficient of kinetic friction between block A and the table is 0.20. What is the acceleration of the blocks? Assume the mass of the rope is negligible and that the pulley is frictionless.