. A 4.0-kg block is at rest on a horizontal oor. If you push horizontally on the 4.0-kg block with a force of 12.0 N, itjust starts to move. (a) What is the coefcient of static friction? (b) A 7.0-kg block is stacked on top of the 4.0kg block. What is the magnitude F of the force, acting horizontally on the 4.0-kg block as before, that is required to make the two blocks start to move (assume that the blocks do not move relative to each other)? Think and Prepare: 0 Draw a free body diagram of the block . What are the properties of static friction force and kinetic friction force? a What do the values of these forces depend on? 2. A heavy lifting crane is being used to stack cargo containers on the deck of a ship. The heaviest container weighs 10 tons (1 ton = 1000 kg). How much force should the crane's cable be able to support if it lifts this container with a) an upward acceleration of 1 m/s? b) a downward acceleration of 1 m/s? c) a downward speed of 1 m/s?- Draw a free body diagram of the container. - In each case, are the forces balanced or unbalanced? In which case are they balanced? In which case are they unbalanced? . How will you set-up Newton's Laws equations