![]() ![]() It is given that the speed of the ball just before it hits the ground is -v and immediately after rebounding it is +v. A tennis ball undergoes an elastic collision when it hits the ground and bounces up. What is correct to say about the final momentum and kinetic energy of the system? The final momentum is zero but the final kinetic energy is positive. When they are ready to leave, Jacques pushes George's canoe with a force F to separate the two canoes. They come to a complete stop and talk for a while. ![]() Jacques and George meet in the middle of a lake while paddling in their canoes. What happens to the speed of the freight car? It decreases. A large load of coal is suddenly dumped into the car. A freight car moves along a frictionless level railroad track at a constant speed. The change in momentum of the smaller mass is equal to the change in momentum of the larger mass. Identical forces act for the same length of time on two different masses. Work is - on the way up and + on the way down Describe the energy of a car driving up a hill. Compare the sign of work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down. If Earth were twice as massive but it revolved around the same distance from the Sun, its orbital period would be 1 year Can work be done on a system if there is no motion? No, since work involves a non-zero displacement Work done by kinetic friction is always zero You throw a ball straight up. If the distance between their centers is cut in half, the gravitational force quadruples. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its speed at that point? sqrt( rg ) Two objects attract each other gravitationally. A roller coaster car (mass = M) is on a track that forms a circular loop (radius = r) in the vertical plane. The 1.0 kg mass is then replaced by a 2.0 kg mass, how far does the spring stretch? 20 cm When an object experiences uniform circular motion, the direction of acceleration is directed towards towards the center of the circular path. A 1.0 kg mass is attached to a hanging spring and the spring stretches 10cm. In what direction is the force that the bed exerts on the crate? Forward. The truck accelerates forward and the crate stays in its place on the truck bed. ![]() The coefficient of static friction between the load and bed is 0.40. A flatbed truck is carrying a crate along a level road. The normal force is always cannot be determined without additional information. The reading on the scale is equal to your weight. You ride on an elevator that is moving downward with constant speed while standing on a bathroom scale. ![]()
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