Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 7A, Problem 2PLA
Static friction is (a) always less than the applied force. (b) always greater than the applied force. (c) less than the applied force up to some maximum force. (d) equal to the applied force up to some maximum force.
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Students have asked these similar questions
A 25 N crate is held at rest on an inclined plane, without friction, by a force parallel to the inclined plane. If the inclined plane makes an angle of 25º with the horizontal, the magnitude of the force is:
a) 23 N
b) 4,6 N
c) 4,1 N
d) 11 N
e) 8,9 N
A 50-N crate sits on a horizontal floor where the coefficient of static friction between the crate and the floor is 0.50.A 20-N force is applied to the crate acting to the right. What is the resulting static friction force acting on the crate?(a) 20 N to the right.(b) 20 N to the left.(c) 25 N to the right.(d) 25 N to the left.(e) None of the above; the crate starts to move.
.A block of mass 0.1 kg is held against a
wall applying a horizontal force of 5N on the
block. If the coefficient of friction between
the block and the wall is 0.5, the magnitude
of the frictional force acting on the block
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Chapter 7A Solutions
Physics Laboratory Manual
Ch. 7A - Prob. 1PLACh. 7A - Static friction is (a) always less than the...Ch. 7A - The two coefficients of friction discussed in this...Ch. 7A - Suppose a block of mass 25.0 kg rests on a...Ch. 7A - For the laboratory measurement of the static...Ch. 7A - Prob. 6PLACh. 7A - Prob. 7PLACh. 7A - For either type of coefficient of friction, what...
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- A box of bananas weighing 40.0 N rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.20. (a) If no horizontal force is applied to the box and the box is at rest, how large is the friction force exerted on it? [ Select ] (b) What is the magnitude of the friction force if a monkey applies a horizontal force of 6.0 N to the box and the box is initially at rest? [ Select ] (c) What minimum horizontal force must the monkey apply to start the box in motion? Select ] (d) What minimum horizontal force must the monkey apply to keep the box moving at constant velocity once it has been started? [ Select ]arrow_forwardWhich is greater? Which has a greater horizontal component, a 100-N force directed at an angle of 60° above the horizontal or a 60-N force directed at an angle of 30° above the horizontal?arrow_forwardA person is pushing a box across a floor. Can the frictional force on the box ever exceed its own weight? Can the frictional force ever exceed the applied force?arrow_forward
- The coefficient of static friction between a 2.0 kg box and a plane inclined 28° to the horizontal is 0.65. What maximum applied force can be exerted on the box without moving it?arrow_forwardSuppose an object is accelerated by a force of 100 N. Suddenly a second force of 100 N in the opposite direction is exerted on the object, so that the forces cancel. The object(a) is brought to rest rapidly.(b) decelerates gradually to rest.(c) continues at the velocity it had before the second forcewas applied.(d) is brought to rest and then accelerates in the direction of the second force.arrow_forward"A 250-kg crate is on a rough ramp, inclined at 30° above the horizontal. The coefficient of kinetic friction between the crate and ramp is 0.22. A horizontal force of 5000 N is applied to the crate, pushing it up the ramp. What is the acceleration of the crate?"arrow_forward
- A 13.5 lb box is placed on the ground. (a)What force (in lb) does the ground exert on the box? magnitude? direction? B) A cord is attached to the box and run through a pulley directly above the box, so that the cord is vertical. The free end of the cord is then connected to a hanging weight. Calculate the force exerted by the ground on the box (in lb), if the hanging weight is 11.0 lb.magnitude?direction? (c) A 35.5 lb weight is substituted for the 11.0 lb weight. Calculate the new force (in lb) exerted by the floor on the box. magnitude?direction?arrow_forwardA 5.0-kg crate is on an incline that makes an angle 30° with the horizontal. If the coefficient of static friction is 0.5, the maximum force that can be applied parallel to the plane without moving the crate is: (А) 3.3 N (в) 21 N C) 46 N D) 55 Narrow_forwardA block of wood of mass 5 kg rests on a horizontal surface. If a horizontal force of 20N is applied to the block and the block is still at rest, calculate the following: (a) the friction force between the surface and the block. (b) the normal force on the block. (C) the coefficient of static friction.arrow_forward
- What force is required to pull a dog in a wagon along a level sidewalk, as in the following figure, at a constant speed if the frictional force is 250 newtons? Constant speed Depends on the speed the wagon is going. Zero newtons. The wagon is already moving. Depends on the mass of the wagon. 250 newtons. O None of the above.arrow_forward7) An object placed in the xy-plane has three forces acting on it: a force of 17.1 N along the x-axis acting at a point (2.6 m, 7.5 m); A force of 9.4 N along the negative y-axis acting at (-15.2 m, -4.9 m); and a force of 10.3 N in the negative x direction acting at (-7.6 m, 11.2 m). What is the net torque about the point (0.55 m, -0.55 m)?arrow_forwardSuppose one's hand exerts a force of 15 N upward on a book weighing 12 N. The reaction to the force of the hand on the book is a force of12 N exerted by the book on the hand.3 N exerted by the book on the hand. 15 N exerted by the book on the hand.12 N exerted by the book on the Earth.10 N exerted by the Earth on the book.arrow_forward
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