f(N) 75.0 - 50.0 25.0 PN) 25.0 50.0 75.0 100.0 125.0 150.0
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In a laboratory experiment on friction, a 135 N block resting
on a rough horizontal table is pulled by a horizontal wire. The pull
gradually increases until the block begins to move and continues to increase
thereafter. Figure shows a graph of the friction force on
this block as a function of the pull. (a) Identify the regions of the graph
where static friction and kinetic friction occur. (b) Find the coefficients
of static friction and kinetic friction between the block and the table. (c)
Why does the graph slant upward at first but then level out? (d) What
would the graph look like if a 135 N brick were placed on the block, and
what would the coefficients of friction be?
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- of air Question 10. A 16.2-kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 65.1 N and is directed at an angle of 30° above the horizontal. Determine the coefficient of kinetic friction. Ans: 0.446 Question 11. A person in tuiA 2.60 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 7.29 N and a vertical force P are then applied to the block (see the figure). The coefficients of friction for the block and surface are us = 0.4 and Pk = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of P is (a)6.00 N and (b)8.00 N. (The upward pull is insufficient to move the block vertically.) (a) Number Units (b) Number UnitsA 1,500-N crate is being pushed across a level floor at a constant speed by a force F of 370 N at an angle of 20.0° below the horizontal, as shown in the figure a below. F 20.0° / b 20.0° (a) What is the coefficient of kinetic friction between the crate and the floor? (Enter your answer to at least three decimal places.) 0.220 X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error.
- Three objects are connected as shown in the figure. The strings and frictionless pulleys have negligible masses. The coefficient of kinetic friction is 0.25 and static friction is 0.30. Block A has a mass of 3 kg and block B has a mass of 4 kg. a) What is the maximum mass block C can have before block B will start to move? b) If block C has a mass of 7 kg. and was 1 m above the ground, how long would it take block C to hit the ground starting from rest?A 1,380-N crate is being pushed across a level floor at a constant speed by a force F of 320 N at an angle of 20.0° below the horizontal, as shown in the figure a below. a) What is the coefficient of kinetic friction between the crate and the floor? (Enter your answer to at least three decimal places.)(b) If the 320-N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in the figure b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).m/s2A sled weighing 53.5 N is pulled horizontally across snow so that the coefficient of kinetic friction between sled and snow is 0.100. A penguin weighing 70.5 N rides on the sled, as in the figure below. If the coefficient of static friction between penguin and sled is 0.700, find the maximum horizontal force that can be exerted on the sled before the penguin begins to slide off.
- Consider an object on an incline where friction is present. The angle between the incline and the horizontal is θ and the coefficient of kinetic friction is μk. Find an expression for the acceleration of this object. Treat down the incline as the positive direction.A 2.03 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.482 and the coefficient of kinetic friction is 0.262. How much force is needed to keep the book moving at a constant speed once it begins moving?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 >
- A 40 N box is resting on a table when a 20 N force is applied to it horizontally. The coefficients of static and kinetic friction are 0.3 and 0.1, respectively. Which of the following best describes the resulting motion of the box? The motion of the box cannot be determined with the given information. The box accelerates in the direction of the applied force. The box remains at rest. The box moves with a constant velocity in the direction of the applied force.A contestant in a winter games event pushes a 37.0 kg block of ice across a frozen lake as shown in the figure below. The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. (For each answer, enter a number.) (a) Calculate the minimum force F (in N) he must exert to get the block moving.A contestant in a winter games event pushes a 59.0 kg block of ice across a frozen lake with a rope over his shoulder as shown in the figure. The coefficient of static friction is 0.1 and the coefficient of the the kinetic friction is 0.03. What is the minimum force (in N) he must exert to get the block moving?