COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 47QAP
To determine
The minimum magnitude of force required to start the crates in motion.
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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?
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
8 - 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-IV
Chapter 5 Solutions
COLLEGE PHYSICS
Ch. 5 - Prob. 1QAPCh. 5 - Prob. 2QAPCh. 5 - Prob. 3QAPCh. 5 - Prob. 4QAPCh. 5 - Prob. 5QAPCh. 5 - Prob. 6QAPCh. 5 - Prob. 7QAPCh. 5 - Prob. 8QAPCh. 5 - Prob. 9QAPCh. 5 - Prob. 10QAP
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- During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 292 N on the wire. The left section of the wire makes an angle of 10.5° relative to the horizontal and sustains a tension of 412 N. Find the (a) magnitude and (b) direction (as an angle relative to horizontal) of the tension that the right section of the wire sustains.arrow_forwardA box with mass 13.0 kg moves on a ramp that is inclined at an angle of 55.0∘ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is μk = 0.300. a. Calculate the magnitude of the acceleration of the box if you push on the box with a constant force 150.0 N that is parallel to the ramp surface and directed down the ramp, moving the box down the ramp. b. Calculate the magnitude of the acceleration of the box if you push on the box with a constant force 150.0 N that is parallel to the ramp surface and directed up the ramp, moving the box up the ramp.arrow_forward3.- A truck tows a 400 kg log from a ditch by means of a winch attached to its rear part. Knowing that the winch applies a constant force F and the coefficient of kinetic friction between the ground and the log is 0.5, determine the force F if the log reaches a speed of 0.5 m / s in 1.8 s. Visual representation (Make drawings or diagrams, clearly indicate the vectors and variables involved in the problem, it can be on the drawing)arrow_forward
- The citizen's car is a 1700-kg Mercedes-Benz 300SL. The citizen manages to park his car next to the express on a highway that rises 15* above the horizontal. The coefficient of kinetic friction between the tires of the car and the road is 0.14. (a) Calculate the magnitudes of the normal forces and the static friction force exerted by the soil on the tires. (b) If at the moment the brakes that hold the car at rest give way and the car begins to move downhill, determine the acceleration and average force with which the car reaches the end of the hill.arrow_forwardA working boy pushes a 15kg lawnmower at a constant speed with force of 90.0N directed along the handle which is at an angle of 30° below horizontal. a.) calculate the friction force the boy is overcoming . b.) calculate the lower reaction force on the mower from the ground. c.) calculate the coefficient of friction between the mower wheels on the ground. d.) calculate how hard the boy would have to push on the handle to give the mower acceleration of 0.80 m/s^2.arrow_forwardA block of mass m lies on a surface that has static and kinetic friction coefficients between the block and the surface are Xe and Xc. The block is initially at rest and a horizontal force F is applied to it.a) Calculate the resultant force on the block if F = 45 N.b) Calculate the minimum value of the magnitude of F, from which the block will move.c) If a force F = 80 N is applied on the block for a time t = 4 s, calculate the horizontal distance that the block travels until it stops.(Data: m = 16 kg. Xe = 0.3. Xc = 0.25. G = 9.8 m/s2)arrow_forward
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