Which simple machines make up a wheel barrow

Modify the equation fδt=δ (mv) to find the force of friction.

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.