Two iron weights, one twice the mass of the other, are dropped from the top of the building. compared with the lighter weight, the twice as heavy weight will be... ​

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

What happens when a rubber rod is rubbed with a piece of fur?

Match each scenario to the form of energy it represents