A 12 kg box slides down a rough ramp as shown in the animation. What is the work done on the box by gravity while it is in motion? Start
Interactive Hint
A 12 kg box slides down a rough ramp at constant speed as shown in the animation. (Note that both gravity and friction do work on the box.) What is the work done on the box by friction while it is in motion? Start
A 0.5 kg box (shown in the animation with time in seconds and position in meters) slides on ice at constant speed for 1.5 seconds when it then encounters a rough surface. What is the work done by friction on the box? Start
The animation shows the top view of a string tied from a smooth peg to a 0.5 kg puck resting on an air hockey table. The puck is given an initial tangential velocity such that it travels at constant speed in a circle around the peg, with time in seconds and position in meters. After one second, the air to the table is turned off and the puck eventually stops. What is the magnitude of the work done by friction on the puck? Start
Two balls are dropped simultaneously as shown in the animation. If the green ball is twice as heavy as the red ball, which ball has more kinetic energy when hitting the ground? The animation neglects air resistance. Start
Use conservation of energy to determine the speed of the pendulum bob when it is at its lowest point (assume negligible loss of energy due to air resistance—position is shown in meters and time is in seconds).Start
Due to air resistance, a real pendulum slows down and eventually stops. For the pendulum shown in the animation, what percentage of its initial energy is lost after 11 seconds? (Assume the pendulum was just released at t=0 s and that zero potential energy is when the pendulum hangs at its lowest position. Also assume that the pendulum bob is much more massive than the string that holds it.) Start
A 0.05 kg marble is projected horizontally as shown in the animation. What is the energy lost due to the collision with the table? (Position is in meters and time is in seconds. Neglect air resistance.) Start
A 0.5 kg cart resting on an air track oscillates as shown in the animation with position in meters and time in seconds. What is the spring constant of the spring? Start
