COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 76QAP
To determine
The coefficient of static friction between the large and the small blocks.
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FT
F2
20
F3
30
A block slides down 3 different inclined planes as shown above. The coefficient of
kinetic friction, µk, is the same between the block and each of the inclines. The
inclines are at angles of 0, 20, and 30 respectively as shown in the figure.
Rank the magnitude of the kinetic friction force, from greatest to least.
F1, F2, F3
F3, F2, F1
Not enough information is given
F1, F2, and F3 are all equal
Problem 3
A 4-kg block rests on a horizontal surface. The block is
pulled by 20 N force acting 25° above the horizontal but
not enough to move the block. Calculate the following:
(a) the friction force between the surface and the block.
(b) the normal force on the block.
(c) the coefficient of static friction.
PART B
1. How does each of the following actions affect friction force?
a. INCREASE in normal force:
b. DECREASE in surface area:
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Chapter 5 Solutions
COLLEGE PHYSICS
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- An object of mass m is dropped al t = 0 from the roof of a building of height h. While the object is falling, a wind blowing parallel to the face of the building exerts a constant horizontal force F on the object. (a) At what time t does the object strike the ground? Express t in terms of g and h. (b) Find an expression in terms of m and F for the acceleration ax of the object in the horizontal direction (taken as the positive x direction). (c) How far is the object displaced horizontally before hitting the ground? Answer in terms of m, g, F, and h. (d) Find the magnitude of the objects acceleration while it is falling, using the variables F, m, and g.arrow_forwardWhen you learn to drive, you discover that you need to up slightly on the brake pedal as you come to a stop or the car will stop with a jerk. Explain this in terms of the relationship between static and friction.arrow_forwardTwo teams of nine members each engage in a tug of war. Each of the first team's members has an average mass of 68 kg and exerts an average force of 1350 N horizontally. Each of the second team's members has an average mass of 73 kg and exerts an average force of 1365 N horizontally. (a) What is magnitude of the acceleration of the two teams? (b) What is the tension in the section of rope between the teams?arrow_forward
- A box rests on the (horizontal) back of a truck. The coefficient of static friction between the box and the surface on which it rests is 0.24. What maximum distance can the truck travel (starting from rest and moving horizontally with constant acceleration) in 3.0 s without having the box slide?arrow_forwardGive reasons for the answers to each of the following questions: (a) Clan a normal force be horizontal? (b) Can a normal force be directed vertically downward? (c) Consider a tennis ball in contact with a stationary floor and with nothing else. Can the normal force be different in magnitude from the gravitational force exerted on the ball? (d) Can the force exerted by the floor on the hall be different in magnitude from the force the ball exerts on the floor?arrow_forwardA block of mass 3.00 kg is pushed up against a wall by a force P that makes an angle of = 50.0 with the horizontal as shown in Figure P5.12. The coefficient of static friction between the block and the wall is 0.250. (a) Determine the possible values for the magnitude of P that allow the block to remain stationary. (b) Describe what happens if P has a larger value and what happens if it is smaller. (c) Repeat parts (a) and (b), assuming the force makes an angle of = 13.0 with the horizontal. Figure P5.12arrow_forward
- Give three important “laws” that characterize frictional interactions between two Solids sliding past one another.arrow_forwardAn object of mass m is dropped from the roof of a building of height h. While the object is falling, a wind blowing parallel to the face of the building exerts a constant horizontal force F on the object. (a) How long does it take the object to strike the ground? Express the time t in terms of g and h. (b) Find an expression in terms of m and F for the acceleration ax of the object in the horizontal direction (taken as the positive x-direction). (c) How far is the object displaced horizontally before hitting the ground? Answer in terms of m, g, F, and h. (d) Find the magnitude of the objects acceleration while it is falling, using the variables F, m, and g.arrow_forwardWhen you learn to drive, you discover that you need to let up slightly on the brake pedal as you come to a stop or the car will stop with a jerk. Explain this in terms of the relationship between static and kinetic friction.arrow_forward
- 2. ) Two blocks of masses m, = m2 = 1.0 kg are at rest on the inclined plane as shown in the figure. Both blocks are made up of different materials such that the coefficient of 3.0 kg and m2 m1 static friction between the surfaces of block m, and incline plane is 0.7, while the coefficient of static friction between the surfaces of block m, and incline plane is 0.5. Answer the following questions. 30° a. Draw a free-body force diagram for the mass m (Remember: the free-body force diagram should be drawn without the body and on XY coordinate axes, where the positive X-axis is downward along the inclined plane)(Show all forces and level the name of the forces clearly) b. Write down Newton's second Law for mass m, along X-axis (Hint: Simply expand the summation in the equation EF, = m,a to include all forces. No calculation is required) С. Find the maximum possible static friction force on mass m.. d. Determine the magnitude of the interaction force between blocks m, and m2. (show all…arrow_forward2 blocks ml and m2 are connected by a rope and are initially laid at rest on a 30-degree incline plane. The plane surface has coefficients of static and kinetic friction at 0.20 and 0,18 respectively for all surfaces. A force 75N paralel to the inclined is applied to prevent the blocks from sliding. (a) Determine the masses of the blocks if m2 is twice as heavy as ml. (b) what value of force (paralel to the inclined) is required to stop the blocks if they were accelerating at 1.2m/s/s?arrow_forwardPart 2) A block with a mass of m = 0.410 kg is placed on a plane that can be tilted, as shown below. The coefficient of static friction between the block and the plane is 4, = 0.350, while the coefficient of kinetic friction between the block and the plane is Hk = 0.270. The angle between the inclined plane and the block is slowly increased. No additional force is applied to the block. m At what angle will the block start to slide down the plane? Part 3) If the plane is at the angle you calculated in Part 2, what will be the acceleration of the block down the plane? a = m/s? down the planearrow_forward
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