Question

1.A block of mass m = 5.00 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of magnitude F = 12.0 N at an angle θ = 25o . (a) Draw the free body diagram of the block. (b) Find the normal force.

2.Two crates are at rest on frictionless horizontal surface. Both crates are connected by a light rope. A woman wearing golf shoes (so she can get traction on the ice) pulls horizontally on the 6.00-kg crate with a force F that gives the crate an acceleration of 2.50 m/s2 . Find the force F and tension on the rope T.

3.The masses of blocks A and B in the figure are 20.0 kg and 10.0 kg, respectively. The blocks are initially at rest on the floor and are connected by a massless string passing over a massless and frictionless pulley. An upward force F is applied to the pulley. Determine (a) the acceleration of the blocks, (b) the tension in the string and (c) the force F. Use Atwood machine theory to solve the problem.

Answer 1

Concept – after drawing the free body diagram, we use Newton’s law of motion to find the normal contact force.

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