COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 39QAP
To determine
The minimum horizontal force that will cause an object resting on a level floor to start sliding up.
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A 10.0 kg box rests on a horizontal floor. The coefficient of static friction is 0.40 and the coefficient of kinetic friction is 0 30. Determine the force of friction, acting on the box if a horizontal applied force is exerted on it of magnitude: (A) 0, (B) 10 N, (C) 20 N, (D) 38 N, and (E) 40 N.
A 2.17-kg object is situated at rest on a horizontal surface with a static friction coefficient of 0.56. Calculate the maximum force of the static friction.
1. A crate is lying on a plane inclined at an angle ɵ. What is the angle between the weight of the crate and the force exerted by the plane on the crate?
a) θ - 180° b) θ c) 180° - θ d) 180°
2. An object is being acted upon by an unbalanced force if
a) it is speeding up b) it is slowing down c) it changes its direction d) all of the above
Chapter 5 Solutions
COLLEGE PHYSICS
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- A 80.0 kg fruit box is initially at rest on a horizontal surface. Salim pulls the bes horizontally with a force F of magnitude 220.0 N. At the same time Ibrahim tries to help Salim by lifting the box with a vertical force P, see figure below. The coefficients of friction for the box and surface are p,= 0.40 and 4,= 0.25. Determine the magnitude of the frictional force acting on the box a) if the magnitude of P is 150.0N b) if the magnitude of P is 280.0 N c) What is the acceleration of the block?arrow_forwardA book sits on a horizontal top of a car as the car accelerates horizontally from rest. If the static coefficient of friction between car top and book is 0.45, what is the maximum acceleration that car can have if the book is not slip?arrow_forward8 - I. The effect that makes the movement of objects difficult is called friction force.II. The friction force is in the opposite direction to the motion.III. The friction force depends on the characteristics of the friction surface.IV. Friction force is inversely proportional to reaction force.Which of the following are / are the correct statements regarding the friction force? A) I-II-IIIB) II-III-IVC) II-IIID) I-II-III-IVE) I-III-IVarrow_forward
- A woman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. The book has a mass of m = 1.7 kg and the coefficient of static friction between her hand and the book is μs = 0.59. Force minimum?arrow_forwardA 200 kg block rests on a horizontal plane. find the magnitude of the force P required to give the block an acceleration of 1.80 m/s^2 to the right. the coefficient of kinetic friction between the block and the plan is 0.25arrow_forwardA 6.00 kg box is pulled horizontally with a 40.0 N force that makes an angle of 50.0° with the horizontal. The coefficient of kinetic friction between the surface and the box is 0.230. Calculate the magnitude of the normal force and the acceleration of the box.arrow_forward
- (II) On an icy day, you worry about parking your car in your driveway, which has an incline of 12°. Your neighbor’s driveway has an incline of 9.0°, and the driveway across the street is at 6.0°. The coefficient of static friction between tire rubber and ice is 0.15. Which driveway(s) will be safe to park in?arrow_forwardThe 118-lb force P is applied to the 250-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume ??= 0.48, ??= 0.38.arrow_forwardA person sits on a sloped hillside. Is it ever possible to have the static friction force on this person point down the hill? Explain.arrow_forward
- A 150-N box is being pulled horizontally in a wagon accelerating uniformly at 3.00 m/s2. The box does not move relative to the wagon, the coefficient of static friction between the box and the wagon's surface is 0.600, and the coefficient of kinetic friction is 0.400. The friction force on this box is closest toarrow_forwardA 300 N block of wood (A) is pressed against the vertical wall by a steel rod that is attached to a block of wood (B), that rests on the horizontal floor. a) Determine the force exerted by the rod. b) Determine the mass of block B which prevents block A from sliding, if the coefficient of static friction of the vertical wall and the horizontal plane are 0.131 and 0.235, respectively.arrow_forwardA 4.0-kg square block is on an incline plane of 30 degrees angle with respect to the ground. 1)What is the minimum coefficient of static friction (μs)min is need to prevent it from sliding down the incline? 2) When the surface μs is 0.30 to prevent the block sliding, a horizontal force F, parallel to the ground, is applied to the block. find the minimum magnitude of F required to keep the block from moving. 3) When a 20 N uphill force is applied to the block, the block starts to move up along the incline. Find the acceleration of the blockarrow_forward
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