Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 5, Problem 4P
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Our 10kg mystery box rests on a horizontal floor. The coefficient of static friction is 0.40and the coefficient kinetic friction is 0.30. Determine tge force of friction, acting on the box if a horizontal applied force is exerted on it of magnitude: (a) 0, (b) 10N, (c) 20N (d) 38N, and (e) 40N.
A 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?
The force Pis applied to the 45-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the
surface on the block if (o) P-0, (b) P-138 N, and (c) P-217 N. (d) What value of P is required to initiate motion up the incline? The
static and kinetic coefficients of friction between the block and the incline are u,-0.19 and -0.13, respectively. The friction force is
positive if up the incline, negative if down the incline.
Answers
(a) F-
(b) F
(c) F=
(d) P.
45 kg
12:
-0.19
0.13
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Chapter 5 Solutions
Physics for Scientists and Engineers
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- A box with a mass of 0.5 slugs lies on an inclined plane making an angle of 30o with the horizontal. If the coefficient of kinetic friction between the box and the plane is 0.4, what is the magnitude of the force that must be applied parallel to the incline to keep the box moving down the incline at a constant speed?arrow_forward1 kg is found A block of mass m = on an inclined plane that makes an angle 30° with the horizontal. The coefficient of static friction and coef- ficient of kinetic friction between the block and the incline are: µs and uk = 0.5. Take the positive di- rection to be up the inclined plane 0.6 %3D 130° With the block initially at rest, the acceleration of the block isarrow_forward(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_forward
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