A stagehand starts sliding a large piece of stage scenery originally at rest by pulling it horizontally with a force of 159 N. What is the coefficient of static friction between the stage floor and the 317 N piece of scenery?
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- A block is at rest on a horizontal floor. There is friction between the block and the floor. The block has a mass = 5.00 kg. A horizontal force of 13.0 Newtons is applied to the block and the block starts to move in the direction of the force. What is the coefficient of static friction?Two workers are sliding 390 kg crate across the floor. One worker pushes forward on the crate with a force of 450 NN while the other pulls in the same direction with a force of 290 NN using a rope connected to the crate. Both forces are horizontal, and the crate slides with a constant speed. What is the crate's coefficient of kinetic friction on the floor?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 78 kg crate rests on a rough horizontal surface. The coefficient of static friction and coefficient of kinetic friction are 0.3 and 0.2, respectively. What is the value of the maximum static friction? Choices: 23.4 N 210.6 N 234.0 N 229.2 NA 235 N crate rests on a ramp; the maximum angle just before it slips is 27.8° with the horizontal. What is the coefficient of static friction between crate and ramp surfaces? Answer:A man exerts a horizontal force of 131 N on a crate with a mass of 36.2 kg. (a) If the crate doesn't move, what's the magnitude of the static friction force (in N)? Make a free-body diagram and apply the x-component of Newton's second law. N (b) What is the minimum possible value of the coefficient of static friction between the crate and the floor? (Assume the crate remains stationary.) Apply the relationship between static friction and the normal force.
- 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?A 32 kg child puts a 15 kg box into a 12 kg wagon. The child then pulls horizontally on the wagon with a force of 65 N. If the box does not move relative to the wagon, what is the static friction force on the box?A girl exerts a horizontal force of 133 N on a box with a mass of 33.2 kg. (a) If the box doesn't move, what's the magnitude of the static friction force (in N)? N (b) What is the minimum possible value of the coefficient of static friction between the box and the floor? (Assume the box remains stationary.)
- A 69 N ice skater is pushed across the ice in a skating rink by a friend. The coefficient of friction between the skater’s ice skates and the ice is 0.10. What force must the friend apply to push the skater at a constant speed across the rink?A block is pressed against a vertical wall by a force F, as the drawing shows. F 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 e is the same. Kinetic friction exists between the block and the wall, and the coefficient of kinetic friction is 0.300. The weight of the block is 57.0 N, and the directional angle for the force F is 0 = 35.0°. Determine the magnitude of when the block slides (a) up the wall and (b) down the wall. (a) P= i (b) P= i