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A: Draw the free body diagram.
Block A in Fig.
weighs 1.90 N, and block B weighs
4.20 N. The coefficient of kinetic
friction between all surfaces is 0.30.
Find the magnitude of the horizontal
force F necessary to drag block
B to the left at constant speed if A
and B are connected by a light, flexible
cord passing around a fixed,
frictionless pulley.
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- A 16 kg block of steel is at rest on a horizontal table. The coefficient of static friction between block and table is 0.54. (a) What is the magnitude of the horizontal force that will put the block on the verge of moving? 84.7 N (b) What is the magnitude of a force acting upward 60° from the horizontal that will put the block on the verge of moving? X N (c) If the force acts down at 60° from the horizontal, how large can its magnitude be without causing the block to move? NA block of mass = 50.0 kg is being dragged at a constant velocity across a floor by a strong person pulling it with a rope. The rope makes an angle of 300 with the horizontal. The tension in the rope is 50.0 Newtons. Assume a real floor, with friction. What is the coefficient of kinetic friction between the box and the floor?You are dragging a toy tractor across a horizontal floor, using a horizontal force. You observe that the toy is moving at a constant speed if you pull with a force of 81 N. If the mass of the toy is 11.09 kg, what is the coefficient of friction? Your Answer: Answer
- A cable attached to a block of mass 13 kg pulls the block along a horizontal floor at a constant velocity. If the tension in the cable is 5.1 N, what is the coefficient of kinetic friction between the block and the floor?Suppose you have a stack of 17 identical steel bars (steel bars have a mass of 1.00kg each). You are required to pull out bar number 16 from the stack (counting from the top of the stack down). Assuming that your assistant holds all other bars in place. If the coefficient of friction between steel and steel is 0.750, how hard do you have to pull (in N)?A block is pressed against a vertical wall by a force F, as the drawing shows. This force can either push the block upward at a constant velocity or allow it to slide downward at a constant velocity. The magnitude of the force is different in the two cases, while the directional angle is the same. Kinetic friction exists between the block and the wall, and the coefficient of kinetic friction is 0.260. The weight of the block is 47.0 N, and the directional angle for the force F is 0 = 48.0°. Determine the magnitude of F when the block slides (a) up the wall and (b) down the wall. (a) P = (b) P= i i P >
- The figure below shows a box with a mass of m= 3.90 kg on a ramp inclined at an angle of 35.0°. The coefficient of static friction between the box and the ramp is 0.250. Find the minimum magnitude of the force F (in N), applied to the box in a direction perpendicular to the ramp, that will prevent the box from sliding down the ramp. N m 35.0°A 423 N crate rests on a ramp; the maximum angle just before it slips is 26.4° with the horizontal. What is the coefficient of static friction between crate and ramp surfaces?You are pulling a 72-kg box at a constant speed of 7.4 m/s. If you're pulling the rope with a force of 300 N at an angle of 37° measured above the horizontal, what is the coefficient of friction between the box and the ground?