Answered: TRUE OR FALSE 1. Friction Force depends…

TRUE OR FALSE 1. Friction Force depends on the type of materials that are in contact and the normal force. 2. If only one force acts on an object, the object can have zero acceleration. 2.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter5: Further Applications Of Newton's Laws: Friction, Drag, And Elasticity

Section: Chapter Questions

Problem 2PE: (a) When rebuilding her car's engine, a physics major must exert 300 N of force to insert a dry...

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(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee? (b) During strenuous exercise it is possible to exert forces to the joints that are easily ten times greater than the weight being supported. What is the maximum force of friction under such conditions? The frictional forces in joints are relatively small in all circumstances except when the joints deteriorate, such as from injury or arthritis. Increased frictional forces can cause further damage and pain.
(a) When rebuilding her car's engine, a physics major must exert 300 N of force to insert a dry steel piston into a steel cylinder. What is the magnitude of the normal force between the piston and cylinder? (b) What is the magnitude of the force would she have to exert if the steel parts were oiled?
In Problem 10, the mass of the sign is 25.4 kg, and the mass of the potted plant is 66.7 kg. a. Assuming the objects are in equilibrium, determine the magnitude of the static friction force experienced by the potted plant. b. What is the maximum value of the static friction force if the coefficient of static friction between the pot and the roof is 0.572?
A 260 N block is placed on a 3:4 [V: H] inclined plane. A 95 N force parallel to the incline acts up on the block. The coefficients on statics & kinetic friction between the block and the plane are 0.25 & 0.2 respectively. Determine whether the block is in equilibrium. a. not in equilibrium b. in equilibrium c. not enough data
1. A block was placed on top of a tilted ramp.The coefficients of impending-slide friction, and sliding friction between the eraser and the ramp are 0.35 and 0.30, respectively. a. What is the maximum slope of the ramp (in degrees) which keeps the block from sliding?(Show solution) A. 19.29 B. 16.70 C. 20.9 D. 17.72
17. I. As deformation undergo during loading; internal friction may accompany this deformation. II. Friction drag is a component of the force resisting the motion of a solid body through a solid. a. I and II are correct statements b. I and II are incorrect statements c. Only I is correct d. Only II is correct
1. Steve pushes a box across a level floor with a constant horizontal force. This causes the box to move at a constant speed, v. The force from Steve: a. has the same magnitude as the weight of the box. b. equals the sum of the box's weight and the total frictional forces opposing the box's motion. c. has the same magnitude as the frictional forces opposing the box's motion. d. has greater magnitude than the frictional forces opposing the box's motion. e. has greater magnitude than the weight of the box. 2. Steve now doubles the force he applies to th box from the previous problem. Which of the following is true? a. The box will move at double the previous speed. b. The box will move with a continuously increasing speed. c. The box will increase speed for a while, then move at a constant speed. d. The box will continue to move at the same speed for a while, then continually increase speed. e. The box will move at a greater constant speed, but not necessarily double the speed.
If a horizontal force is applied to an object, how can you tell if an object will start moving? A.The object will start moving if any force is applied. B.The object will start moving if the applied force is greater than the maximum static friction. C.The object will start moving if the applied force is greater than the minimum static friction. D.The object will start moving if the applied force is greater than the maximum kinetic friction. E.The object will start moving if the applied force is greater than the minimum kinetic friction
1. You attach a force scale to a toboggan resting in the snow. a) What is the minimum value of static frictional force and under what conditionswould you observe that value on your force scale? b) What two (equal in magnitude and opposite in direction) forces is the scalemeasuring when you start to pull on the toboggan but it remains stationary? Bespecific. c) What happens to the number on the force scale as you start to pull on thetoboggan but it remains stationary? Explain. d) What happens to the toboggan if your applied force exceeds the maximum staticfrictional force? e) What happens to the number on the force scale in the moment the tobogganstarts to move? Explain. f) What two (equal in magnitude and opposite in direction) forces is the scalemeasuring when you pull on the toboggan and it moves at a constant speed. Bespecific. 2. The coefficient of static friction between a toboggan and dry snow is 0.50. If thetoboggan’s mass is 9.75 kg, what is the minimum applied force required…
1. You are trying to lift a box of weight W' vertically off the floor. You apply a force, Fup, on the box trying to lift it but the box does not move. If N is the normal force on the block from the floor while you are trying to lift it, which relationship below must be true? a. N= W b. N+ Fup W d. N+ Fup = W
1. An object weighing 4 kg is on a rough surface. A force F is applied to the object, calculate the maximum force that may be applied that the object will stay at rest. Coefficient of friction = 0.52. A 25 kg box is to be pushed up an inclined plane. How much force must the worker exert in order to overcome the static friction (no acceleration)? Coefficient of static friction of surface = 0.3
1. A sanding block is being pushed up a vertical wall by a force F that is being applied at an angle of ? = 33.0° to the vertical as shown in the diagram. The block is moving up the wall at a constant speed. The mass of the block is 0.523 kg and the coefficient of kinetic friction between the block and the wall is 0.937. Calculate the magnitude of the force F. To receive full marks, you must include a diagram showing the physical situation and your choice of coordinate system. 2. A 46.7-kg person, initially at rest, throws a 0.143-kg snowball forward with a horizontal speed of 33.5 m/s. A second person, with a mass of 47.5 kg, catches the snowball. Both people are on skates. The first person is initially at rest, as mentioned, and the second person is initially moving with a speed of 1.45 m/s toward the first person. Disregard air resistance and the friction between the skates and the ice. Take the direction in which the snowball is thrown to be the positive direction. Indicate the…