College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 5, Problem 4PE
Suppose you have a 120-kg wooden crate resting on a wood floor. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will the magnitude of its acceleration then be?
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Suppose you have a 120 kg wooden crate resting on a wood floor, with coefficient of static friction
0.500 between these wood surfaces. (a) What maximum force can you exert horizontally on the crate
without moving it? (b) If you continue to exert this force once the crate starts to slip, what will its
acceleration then be? The coefficient of sliding friction is known to be 0.300 for this situation.
Suppose you have a 120-kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (a) What maximum force can you exert horizontally on the crate without moving it? (b) If you continue to exert this force once the crate starts to slip, what will its acceleration then be? The coefficient of sliding friction is known to be 0.300 for this situation.
A box of banana 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 the box?
(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?
(c) What minimum horizontal force must the monkey apply to start the
box in motion?
(d) What minimum horizontal force must the monkey apply to keep the
box moving at constant velocity once it has been started?
(e) if the monkey applies a horizontal force of 18.0 N, what is the
magnitude of the friction force and what is the box's acceleration?
Chapter 5 Solutions
College Physics
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- A bag of cement weighing 325 N hangs in equilibrium from three wires as suggested in Figure P4.23. Two of the wires make angles 1 = 60.0 and 2 = 40.0 with the horizontal. Assuming the system is in equilibrium, find the tensions T1, T2, and T3 in the wires. Figure P4.23 Problems 23 and 24.arrow_forwardFor the woman being pulled forward on the toboggan in Figure 4.33, is the magnitude of the normal force exerted by the ground on the toboggan (a) equal to the total weight of the woman plus the toboggan, (b) greater than the total weight, (c) less than the total weight, or (d) possibly greater than or less than the total weight, depending on the size of the weight relative to the tension in the rope?arrow_forwardA crate of mass 61 kg lies on a flat floor. A person exerts a horizontal force of 141 N on it. If the crate doesn’t move, what’s the magnitude of the static friction force?arrow_forward
- Suppose you have a 116-kg wooden crate resting on a wood floor. (?k = 0.3 and ?s = 0.5) What maximum force (in N) can you exert horizontally on the crate without moving it?arrow_forwardA worker pulls a 15-kg crate in a straight line on a level surface by imparting a horizontal tension of 80 N to the free end of a cable whose other end is attached to the crate. If the coefficient of static friction is 0.40, what is the acceleration of the crate?arrow_forwardLogs weighing 1.3 kg and 2.2 kg lie on a flat surface and are connected by a rope that breaks at a force of 20 N. The coefficient of friction between the lighter log and the base is 0.50, and between the heavier log and the base 0.30. With what maximum force can we pull the lighter log so that the string does not break?arrow_forward
- When a 100 N bag of nails hangs motionless from a single vertical strand of rope, how many newtons of tension are exerted in the strand? What if the bag is supported by four vertical strands?arrow_forwardSketch two cables, one at 17.3° and another at 12.8° from the ceiling, hold a 1989.8 kg platform. A 10.2 kg penguin suddenly falls on top of the platform and decides to sleep there for the night. Under these odd circumstances, calculate the tension in each cable.arrow_forwardAn early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 6500 N. When the craft was lowered or raised at a steady rate, the motion through the water added an 1800 N drag force. What was the tension in the cable when the craft was being lowered to the seafloor?arrow_forward
- If you press an apple crate against a wall so hard that the crate cannot slide down thewall, what is the direction of (a) the static frictional force fs on the crate from the wall and (b)the normal force FN on the crate from the wall? If you increase your push, what happens to (c)fs, (d) FN, and (e) fs,max?arrow_forwardYou can hold your 2.5 kg textbook against the wall, preventing it from slipping down, if you press your hand against it horizontally. Suppose the coefficient of static friction between the book and the wall is 0.50, and there is no friction between your hand and the book. What minimum force do you need to apply to keep the book from slipping down?arrow_forwardA 25 kg wooden plate is held in place by two strings attched to the ceiling and the wall. The string attched to the ceiling makes an angle 40° with the horizontal and the string attached to the wall makes 90° with the wall. Determine the force in each string.arrow_forward
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