Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 5.8, Problem 5.6QQ
You press your physics textbook flat against a vertical wall with your hand. What is the direction of the friction force exerted by the wall on the book? (a) downward (b) upward (c) out from the wall (d) into the wall
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A block of mass m1 is placed on top of a block of mass m2. You push the two blocks so that they move up a vertical wall, with a constant force of magnitude P directed at angle theta. The coefficient of friction between m2 and the wall is u. There is no friction between the blocks and no friction between m1 and the wall. Find the force exerted by the lower block on the upper block.
The answer the book gives me is (P(cos(theta)-u*sin(theta)))/(1+(m2/m1))
I get how to get the numerator but am unsure of how the denominator answer was gotten and where gravity went in the equation
If a box on a horizontal surface has an externally applied horizontal force that exceeds the value of the static frictional force, the box is defined to be.
Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 20.0 kg and box B has mass 5.0 kg. A horizontal force of 100 N is exerted on box B. What is the magnitude of the force that box B exerts on box A?
Chapter 5 Solutions
Physics for Scientists and Engineers
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- A 20 kg sled is being pulled along the ground by a 100 N force directed 30° above horizontal. Given the coefficient of kinetic friction between the sled and the snow is 0.100, what is the magnitude of the friction acting on the sled?arrow_forwardA woman is trying to pull a loaded sled of mass m=75 kg along a horizontal surface with a rope. The coefficient of friction between the sled and the snow is 0.10 and the angle made by the rope with the horizontal is 42 degrees. What is the magnitude of the tension force T on the sled from the rope?arrow_forwardIf you press an apple crate against a wall so hard that the crate cannot slide down the wall, what is the direction of (a) the static frictional force on the crate from the wall and (b) the normal force on the crate from the wall? If you increase your push, what happens to (c) fs, (d) FN, and (e) fs,max?arrow_forward
- A block (mass = 200.00 g) is placed on an inclined plane 45 degrees from the horizontal. The coefficient of static and kinetic friction between the block and the plane are 0.54 and 0.35, respectively. What is the frictional force between the block and the plane?arrow_forwardA block of mass 4.20 kg is pushed up against a wall by a force P that makes an angle of θ = 50.0°angle with the horizontal as shown below. The coefficient of static friction between the block and the wall is 0.270.arrow_forwardA 19 kg box is being pushed uniformly across a horizontal surface with which the coefficient of kinetic friction between the box and the floor is 0.266. With what force does a person need to push the box in order for the box to move with no acceleration?arrow_forward
- If the cart is moving with constant velocity, what is the magnitude of the frictional force between the cart's wheels and the surface?arrow_forwardA 750 N box moves at a constant velocity on a floor with a coefficient of static friction μs = 0.800 and coefficient of kinetic friction μk = 0.600. What horizontal force is required to keep the box moving? Multiple Choice 750 N 450 N 600 N 550 N 500 Narrow_forwardA balikbayan package of mass m2 on a rough, horizontal surface is connected to a net of fish of mass m1 by a frictionless rope over a pulley of negligible mass and friction as shown in the figure. A force of magnitude P at an angle of 30 with the horizontal is applied to the package. The balikbayan package slides to the right. The coefficient of kinetic friction between the package and the surface is µk . Determine the magnitude of the acceleration.arrow_forward
- Which of the following statements about friction is not true? * A. An object of large mass is pulled down onto a surface with a greater force than an object of low mass and, as a consequence, experiences a greater friction B. The direction of friction is always opposite to the direction of motion C. Friction is a force D. The direction of friction is always the same as the direction of motionarrow_forwardThree cables are used to tie the balloon shown in Figure. Determine the magnitude of the vertical force (P) exerted by the balloon at A, knowing that the tension in cable AD is 1.041 N y1 = 4.3 m y2 = 2 m x1 = 4.3 m x2 = 3.3 m z = 5.6 m .arrow_forwardWhat is the maximum horizontal force that is required to cause a 15kg box to begin to slide along a horizontal surface if the coefficient of static friction is 0.20?arrow_forward
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