A child sits on a merry-go-round at the position marked by the red circle (position is in meters and time is in seconds). What is her angular acceleration? Start

A turntable of mass 5 kg rotates at constant speed when your finger makes contact with the outer edge as shown in the animation (position of a point on the outer edge of the turntable is shown in meters and time is shown in seconds). Friction between your finger and the turntable causes the turntable to stop. What is the direction of the torque on the turntable by the frictional force? Start

A giant 2.5 kg yellow yo-yo, made of two solid yellow disks and a massless red hub, is shown in the animation (position in meters and time is in seconds). Determine the torque that the string exerts. Start

Two masses M=2.5kg and m=1kg are attached with a massles string over a pulley as shown in the animation (position is in centimeters and time is in seconds). The bearings in the pulley are frictionless and the string does not slip.What is the moment of inertia of the pulley? Start

A 2.5 kg rotating red disk is connected by a string, over a pulley of mass m=1 kg to a hanging mass as shown in the animation (position is in centimeters and time is in seconds). The bearings in the pulley are frictionless and the string does not slip.What is the black block's mass? 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? Start

A man standing to the side of a 150 kg merry-go-round suddenly jumps on as shown in the animation (position of the man is represented by the red circle and is shown in meters and time is in secods). What is the mass of the man? Start