is at rest on a horizontal floor.  A 22 kg child sits on top of the box.  A person pushes the box with a horizontal force of

A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 6.5 N and a vertical force P are then applied to the block. The coefficients of friction for the block and surface are us = 0.43 and MK = 0.22. P (a) Determine the magnitude of the frictional force acting on the block if the magnitude of P is 8.0 N. (b) Determine the magnitude of the frictional force acting on the block if the magnitude of P is 10.0 N. (c) Determine the magnitude of the frictional force acting on the block if the magnitude of P is 12.0 N.

Sammy is doing a strength testing session on the turf in preparation for the upcoming basketball season.  Sammy's mass is 55 kg and she is trying to push a 105 kg sled across the artificial turf outside on Raymond Field.  The coefficient of static friction between the sled and the turf is 0.3.  If Sammy pushes only horizontally against the sled, how much force must she push with to just initiate movement of the sled?

A wracking ball is suspended below two cables each at an angle with the horizontal. The left cable has tension T1 and angle 42 degrees with the horizontal. The right cable has tension T2 and angle 27 degrees with the horizontal. The Wracking ball has mass 160 kg. Find the magnitude of tension T1.