Which of the following sentence is not correct?The direction of friction is always perpendicular to the direction of the gravityforce (weight) of the object.The direction of friction is always perpendicular to the normal force.The direction of friction is always parallel to the surface between objects.The direction of friction is always opposite to the direction of motion of theobject.Question 3Compared with the force needed to keep a box to slide at constant velocity on acoarse surface, to start the box sliding usually needsless force.same force.more force. A 153kg big box is resting on a level floor. The coefficient of static and kineticfriction are 0.5 and 0.4 respectively. What is the minimum force to make the big boxstarting to slide?600N1500N750N500NQuestion 5A 153kg big box is sliding at a constant velocity on a level floor. The coefficient ofstatic and kinetic friction are 0.5 and 0.4 respectively. What is the force to make thebig box slides continuously?

Answered: Image /qna-images/answer/6a8d3cc6-eccf-4dc0-91bb-c4805977f517.jpg

Answered: Compared with the force needed to keep…

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter6: Applications Of Newton's Laws

Section: Chapter Questions

Problem 37P: An elevator filled with passengers has a mass of 1.70103kg . (a) The elevator accelerates upward...

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An elevator filled with passengers has a mass of 1.70103kg . (a) The elevator accelerates upward from rest at a rate of 1.20m/s2for 1.50 s. Calculate the tension in the cable supporting the elevator. (b) The elevator continues upward at constant velocity for 8.50 s. What is the tension in the cable during this time? (c) The elevator decelerates at a rate of 0.600 in/s2 for 0.600m/s2 3.00 s. What is the tension in the cable during deceleration? (d) How high has the elevator moved above its original starting point, and what is its final velocity?
The traffic light hangs from the cables as shown. Draw a free-body diagram on a coordinate plane for this situation.
Meredith is driving her truck down a 12.0° slope at 60.0 mph (26.8 m/s) and has to brake suddenly for a deer. If the coefficients of static and kinetic friction between the tires and road are nano (static)= 0.85 and nano (kinetic)= 0.55, what is the maximum deceleration that the truck can experience with proper braking? Show the forces needed on a diagram and calculations.
Two boxes of fruit on a frictionless horizontal surface are connected by a light string , where m1 = 15 kg and m2 = 17 kg. A force of 58 N is applied to the 17 kg box.Repeat the problem for the case where the coefficient of kinetic friction between each box and the surface is 0.09.a) find the accelerationb) find the tension in the string
Suppose the coefficient of static friction between a penny and the back wall of a rocket car is 0.261. At what minimum rate (in m/s2) would the car have to accelerate so that a penny placed on the back wall would remain in place? Draw the coin's free-body diagram, find an expression for the normal force using the x-component of Newton's second law, and solve for the required acceleration using the y-component of Newton's second law after substituting fs, max = μsn. ___m/s^2
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A woman pushes a block of mass m = 25.0 kg up a rough plane sloped at an angle of θ = 20◦ by using her hand. She pushes with a force of 150 N parallel to the surface of the incline which as a friction coefficient of 0.25. What is the normal force FN of the plane on the block? What is the force of friction fk acting on the block? What is the acceleration a of the block on the plane?
A contestant in a winter sporting event pulls a 43 kg block of ice in the positive horizontal direction with a rope over his shoulders across a frozen lake as shown in the figure. Assume the coefficients of static and kinetic friction are µs=0.1 and µk=0.03. Calculate the minimum force F he must exert to get the block sliding in newtons? What is its acceleration in m/s2 once it starts to move, if that force is maintained?
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Compared with the force needed to keep a box to slide at constant velocity on a coarse surface, to start the box sliding usually needs