A child sits on a merry-go-round at the position marked by the red circle. What is her angular speed? Start
A quarter and a penny rest on a turntable as shown in the animation. Which coin has the greater angular speed? Start
Interactive Hint
A boy sits on a merry-go-round at the position marked by the red circle. A girl gives the merry-go-round a constant tangential push for 0.21 seconds as shown in the animation (position is in meters and time is in seconds). What is the magnitude of the tangential acceleration of the boy while the girl is pushing the merry-go-round? Start
A car starts from rest and accelerates until it is half way around a circular track after which time it moves at constant speed. The acceleration vector is shown in black. What is the angular acceleration during the first 5 seconds? Start
A wheel rolls as shown in the animation (position of the center of mass and position of a a point on the edge of the wheel are shown in meters and time is shown in seconds). What is the velocity of a point on the edge of the wheel when it is at the highest point (with respect to the floor)? Start
A grinding wheel of mass 5 kg rotates at constant speed when an object makes contact with the outer edge as shown in the animation (position of a point on the outer edge of the wheel is shown in meters and time is shown in seconds). Friction causes the wheel to stop. What is the average torque on the wheel by the frictional force? Start
A 3 kg wheel rolling on a rough surface eventually stops as shown in the animation (position of the center of mass and position of a a point on the edge of the wheel are shown in meters and time is shown in seconds). What is the magnitude of the average force exerted by friction on the wheel? Start
A large wheel (i.e. a flat cylinder) is used to rotate a small wheel of the same density and thickness as shown in the animation (position of a point on the edge of each wheel is shown in meters and time is shown in seconds). What is the ratio of the kinetic energy of the green wheel to the kinetic energy of the red wheel (Kgreen/ Kred)? Start
A puck sliding on an air table collides with another puck of equal mass which is attached to a string as shown in the animation. What quantities are conserved by the collision.? Start
