COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 46QAP
To determine
The acceleration of the box.
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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?
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 9.54-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.432. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an acceleration whose magnitude is 2.55 m/s2, and (c) accelerating downward with an acceleration whose magnitude is 2.55 m/s2.arrow_forwardA 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.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
- A 2.0 kg box is at rest on a flat horizontal surface. A continuously applied force is then exertedon the box. When the applied force just exceeds 5.0N the box then begins to move. Q1. Construct a free-body diagram for the box at the moment when the applied force is 5.0N. Q2. Determine the magnitude of the peak static friction force and the corresponding coefficientof static friction.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_forwardA truck loads a 10.0 kg box on its platform, the coefficients of friction between the surface of the truck and the box are: μk=0.200 and μs=0.500. When the truck climbs a 10.0∘ inclined road with an acceleration of 1.00 m/s2, the box remains at relative rest on the surface of the truck. a) Determine the force of static friction acting on the box at that moment. Suddenly and instantaneously, the driver accelerates the truck to 4.00 m/s2, and the box begins to slide on the surface of the truck. c) If the box is 2.00 m from the end of the truck bed, how long will it take to travel that distance?arrow_forward
- A 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_forward1. Explain why the following situation is impossible. Your 3.80 kg physics book is placed next to you on the horizontal seat of your car. The coefficient of static friction between the book and the seat is 0.650, and the coefficient of kinetic friction is 0.550. You are travelling forward at 72.0 km/h and you hit the brakes to a stop with a constant acceleration over a distance of 30.0 m. Your physics book remains on the seat rather than sliding forward onto the floor.arrow_forwardA block of mass 4.20 kg is pushed up against a wall by a force P that makes an angle of θ = 50.0° angle with the horizontal as shown below. The coefficient of static friction between the block and the wall is 0.300. (a) Determine the possible values for the magnitude of P that allow the block to remain stationary. (If there is no maximum, enter NONE in that answer blank.) |Pmax| = N |Pmin| = Narrow_forward
- Two blocks of masses m1 and m2, are placed on a table in contact with each other as discussed in Example 5.7 and shown in Figure 5.13a. The coefficient of kinetic friction between the block of mass m1 and the table is 1, and that between the block of mass m2 and the table is 2. A horizontal force of magnitude F is applied to the block of mass m1. We wish to find P, the magnitude of the contact force between the blocks. (a) Draw diagrams showing the forces for each block. (b) What is the net force on the system of two blocks? (c) What is the net force acting on m1? (d) What is the net force acting on m2? (e) Write Newtons second law in the x direction for each block. (f) Solve the two equations in two unknowns for the acceleration a of the blocks in terms of the masses, the applied force F, the coefficients of friction, and g. (g) Find the magnitude P of the contact force between the blocks in terms of the same quantities.arrow_forwardAn automobile driver traveling down an 8% grade slams on his brakes and skids 30 m before hitting a parked car. A lawyer hires an expert who measures the coefficient of kinetic friction between the tires and road to be k = 0.45. Is the lawyer correct to accuse the driver of exceeding the 25-MPH speed limit? Explain.arrow_forward
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