A pulley system consits of two fixed pulleys and two movable pullys that lift a load that has a weight of 300 N. If the effort force used to lift the load is 100 N, What is the mechnaical advantage of the system?
A skater is a mass of 50 kg slides across an icy pond with negligible friction. As he approaches a frienD, both he and his friend hold out their hands, and the friend exerts a force in the direction opposite to the skater's movement, which slows the skater's speed from 2.0 m/s2 to 1.0 m/s2. What is the change in the skater's kinetic energy?
A 4N soccer ball sits motionless on a field. A player's foot exerts a force of 5N on the ball for a distance of 0.1 m, and the ball rolls a distance of 10m. How much kinetic energy does the ball gain from the player?