Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 5, Problem 41P
To determine
To evaluate: The magnitude of the force P needed to drag crate at constant velocity is to be calculated.
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A horizontal force of 200 N is used to push a 50.0-kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at constant speed, the coefficient of kinetic friction between the crate and surface.
A particle of mass 6 kg is placed on a rough plane
inclined at an angle a to the horizontal where sin a =
0.8. The coefficient of friction between the particle
and the plane is 0.4. An upward force PN actson the
particle along a line of greatest slope of the plane.
Find
the greatest value of P
NEWTON'S LAWS WITH FRICTION PH 421
5 0 A 2.5 kg block is initially at rest on a horizontal surface. A
horizontal force F of magnitude 6.0 N and a vertical force P are
then applied to the block (Fig. 6-17). The coefficients of friction for
the block and surface are M,
magnitude of the frictional force acting on the block if the magni-
tude of P is (a) 8.0 N, (b) 10 N, and (c) 12 N.
= 0.40 and H = 0.25. Determine the
%3D
N.
F.
Flg. 6-17 Problem 5.
Chapter 5 Solutions
Physics Fundamentals
Ch. 5 - Prob. 1QCh. 5 - Prob. 2QCh. 5 - Prob. 3QCh. 5 - Prob. 4QCh. 5 - Prob. 5QCh. 5 - Prob. 6QCh. 5 - Prob. 7QCh. 5 - Prob. 8QCh. 5 - Prob. 9QCh. 5 - Prob. 10Q
Ch. 5 - Prob. 11QCh. 5 - Prob. 12QCh. 5 - Prob. 13QCh. 5 - Prob. 14QCh. 5 - Prob. 15QCh. 5 - Prob. 16QCh. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8PCh. 5 - Prob. 9PCh. 5 - Prob. 10PCh. 5 - Prob. 11PCh. 5 - Prob. 12PCh. 5 - Prob. 13PCh. 5 - Prob. 14PCh. 5 - Prob. 15PCh. 5 - Prob. 16PCh. 5 - Prob. 17PCh. 5 - Prob. 18PCh. 5 - Prob. 19PCh. 5 - Prob. 20PCh. 5 - Prob. 21PCh. 5 - Prob. 22PCh. 5 - Prob. 23PCh. 5 - Prob. 24PCh. 5 - Prob. 25PCh. 5 - Prob. 26PCh. 5 - Prob. 27PCh. 5 - Prob. 28PCh. 5 - Prob. 29PCh. 5 - Prob. 30PCh. 5 - Prob. 31PCh. 5 - Prob. 32PCh. 5 - Prob. 33PCh. 5 - Prob. 34PCh. 5 - Prob. 35PCh. 5 - Prob. 36PCh. 5 - Prob. 37PCh. 5 - Prob. 38PCh. 5 - Prob. 39PCh. 5 - Prob. 40PCh. 5 - Prob. 41PCh. 5 - Prob. 42PCh. 5 - Prob. 43PCh. 5 - Prob. 44PCh. 5 - Prob. 45PCh. 5 - Prob. 46PCh. 5 - Prob. 47PCh. 5 - Prob. 48PCh. 5 - Prob. 49PCh. 5 - Prob. 50PCh. 5 - Prob. 51PCh. 5 - Prob. 52PCh. 5 - Prob. 53PCh. 5 - Prob. 54PCh. 5 - Prob. 55P
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- (b) The coefficient of kinetic friction between a 40 kg crate and the ware- house floor is 70% of the corresponding coefficient of static friction. The crate falls off a forklift that is moving at 3 m/s and then slides along the warehouse floor for a distance of 2.5 m before coming to rest. What is the coefficient of static friction between the crate and the floor?arrow_forwardA 2.20 kg block is initially at rest on a horizontal surface. A horizontal force of magnitude 4.83 N and a vertical force are then applied to the block (Fig. 6-17). The coefficients of friction for the block and surface are µs = 0.4 and µk = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of is (a) 8.00 N and (b) 12.0 N. (The upward pull is insufficient to move the block vertically.)arrow_forwardA 5 kg box sits at rest at the bottom of a ramp that is 8 m long and that is inclined at 30° above the horizontal. Thecoefficient of kinetic friction is 0.40 and the coefficient of static friction is 0.50. What constant force, appliedparallel to the surface of the ramp is required to push the box to the top of the ramp in a time of 4 s?arrow_forward
- An 8 kg block rests on a horizontal surface whose coefficients of friction are: s = 0.4 and k = 0.2. The maximum force that can be applied to the block so that it does not move is?arrow_forwardIn figure (a) below, a sled is held on an inclined plane by a cord pulling directly up the plane. The sled is to be on the verge of moving up the plane. In figure (b) below, the magnitude F required of the cord's force on the sled is plotted versus a range of values for the coefficient of static friction us between sled and plane: F1 = 2.5 N, F, = 5.3 N, and µɔ = 0.65. At what angle 0 is the plane inclined? o above the horizontal F F2 (a) (b)arrow_forwardIf the coefficient of kinetic friction between tires and dry pavement is 0.80, what is the shortest distance in which you can stop a car by locking the brakes when the car is traveling at 28.7 m>s (about 65 mi>h)?arrow_forward
- vel Flg. 6-23 Problems 16 and 22. 17 In Fig. 6-24, a force P acts on a block weighing 45 N. The block is initially at rest on a plane inclined at angle 0 15° to the horizontal. The positive direction of the x axis is up the plane. The coefficients of friction between block and plane are u, u = 0.34. In unit-vector notation, what is the frictional force on the block from the plane when P is (a) (-5.0 N)i, (b) (-8.0 N)i, and (c) (-15 N)i? 0.50 and 0000arrow_forwardBlock B in Fig. 6-31 weighs 711 N.The coefficient of static friction between block and table is 0.25; angle u is 30; assume that the cord between B and the knot is horizontal. Find the maximum weight of block A for which the system will be stationary.arrow_forwardHow much force is required to be exerted on a block weighing 200lb to reach a = 10ft/s2 towards the east? Assume a kinetic friction coefficient of 0.25.arrow_forward
- A rope exerts a force of 50 N on a box to keep it stationary. If the box is on a plane inclined 25° from the horizontal and the coefficient of static friction is 0.29, calculate the normal force exerted on the box.arrow_forwardA 0.85 kg block of wood is stationary on an incline that is15◦above horizontal. A force of 3.0 N is being applied toit 75◦below horizontal, directly into the incline (the force isperpendicular to the incline). What is the minimum coefficientof static friction required to keep the block stationary?arrow_forwardA force of 600 N is applied on a block of mass M to pull it at a constant velocity up the incline at an angle of 30degrees with the horizontal. The coefficient of kinetic friction between the surface of the incline and the block is 0.5. Calculate the mass of the block.arrow_forward
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