COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 3QAP
To determine
The question asks one to explain if the friction force always the sliding of an object how it could cause an object to increase the speed.
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69. A locomotive pulls 10 identical freight cars. The
force between the locomotive and the first car is
100,000 N and the acceleration of the train is 2 m/s.
There is no friction to consider. Find the force between
the ninth and tenth cars. SSM
The uniform crate has a mass of 150 kg. If the coefficient of static friction between the crate and the floor is us = 0.2, determine the smallest mass of the man so he can move the crate. The coefficient of static friction between his shoes and the floor is us = 0.45.
Assume the man exerts only a horizontal force on the crate
2.4 m
1.6 m
-1.2 m-
•9 0 A 3.5 kg block is pushed
along a horizontal floor by a force
F of magnitude 15 N at an angle
e = 40° with the horizontal
(Fig. 6-19). The coefficient of ki-
netic friction between the block
Flg. 6-19
Problems 9 and 32.
and the floor is 0.25. Calculate the
magnitudes of (a) the frictional
force on the block from the floor
and (b) the block's accelération.
•10 Figuré 6-20 shows an initially.
stationary block of mass m on a
floor. A force of magnitude
0.500mg is then applied at upward
angle e= 20°. What is the magni-
tude of the acceleration of the
Flg. 6-20 Problem 10.
www.
block across the floor if the friction coefficients are (a) u, = 0.600
and u = 0.500 and (b) , = 0.400 and 4
0.300?
Chapter 5 Solutions
COLLEGE PHYSICS
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- If you press a book flat against a vertical wall with your hand, in what direction is the friction force exerted by the wall on the book? (a) downward (b) upward (c) out from the wall (d) into the wall.arrow_forwardA uniform pole is propped between the floor and the ceiling of a room. The height of the room is 7.80 ft, and the coefficient of static friction between the pole and the ceiling is 0.576. The coefficient of static friction between the pole and the floor is greater than that between the pole and the ceiling. What is the length of the longest pole that can be propped between the floor and the ceiling?arrow_forward5-82. The sign has a mass of 100 kg with center of mass at G. Determine the x, y, z components of reaction at the ball-and-socket joint A and the tension in wires BC and BD. QD 1'm 2 m •G 1 m 1 marrow_forward
- 2) An object with a mass of 10 kg is initially at rest at the top of a inclined plane that rises at 30° above the horizontal. At the top, the object is initially 8.0 m from the bottom of the incline, as shown in the figure. When the object is released from this position, it eventually stops at a distanced from the bottom of the inclined plane along a horizontal surface, as shown. The coefficient of kinetic friction between the horizontal surface and the object is 0.20 and between the incline and the block is 0.12. Find the distance d. ( Take the air resistance as negligible). 8.0 m 30°arrow_forward*49. ssm A person is trying to judge whether a picture (mass = 1.10 kg) is properly positioned by temporarily pressing it against a wall. The press- ing force is perpendicular to the wall. The coefficient of static friction between the picture and the wall is 0.660. What is the minimum amount of pressing force that must be used?arrow_forward•4 A slide-loving pig slides down a certain 35° slide in twice the time it would take to slide down a frictionless 35° slide. What is the coefficient of kinetic friction between the pig and the slide?arrow_forward
- A skier is on a mountain whose slope is 20 °. The coefficient of kinetic friction is 0.22. At a certain instant, he has a speed of 8.9 m / s and from that moment he travels 120 m, what is the speed at the end of that journey? a) 19.90 m/s b) 29.12 m/s c) 46.19 m/s d) 23.81 m/sarrow_forward*63. ssm A 44-kg chandelier is suspended 1.5 m belov wires, each of which has the same tension and the sa (see the drawing). Find the tension in each wire. 1.5 m 2.0 marrow_forward5) A 640-N hunter gets a rope around a 3200-N polar bear. They are initially stationary, 20 meters apart, on frictionless level ice. The hunter now pulls on the rope such that she and the polar bear slide closer together. This continues until they eventually meet at some point on the ice. What total distance will the polar bear have slid? a) 1.0 m b) 3.3 m c) 10 m d) 12 m e) 17 marrow_forward
- A car drives onto a section of the road which is covered in ice. The driver attempts to stop by hitting the brakes but the wheels lock and the car skids for another 60 m. Determine the coefficient of kinetic friction between the wheels and the ice if the initial speed of the car was 40 km/hr.arrow_forward"A 1kg particle moves along an x-axis according to v = 2 +9t - 9t2, with v in meters per second and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 4s? " -72N î -63N î -28N î -18N îarrow_forward1) A bartender slides a mug of beer with mass 0.2 kg down a smooth, level bar. The mug leaves the bartender's hand at an initial velocity of 2.8m/s. As the mug slides, it slows down due to the effect of friction between the mug and bar. The mug just comes to rest in the customer’s hand 1.0 m away from the bartender. Calculate the magnitude and direction of the frictional force acting on the mugarrow_forward
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