Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 3PLA
Suppose a block of mass 25.0 kg rests on a horizontal plane, and the coefficient of static friction between the surfaces is 0.220. (a) What is the maximum possible static frictional force that could act on the block? _______N (b) What is the actual static frictional force that acts on the block if an external force of 25.0 N acts horizontally on the block? _______N Assume g = 9.80 m/s2. Show your work and explain both answers.
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Suppose a block of mass 25.0kg rests on a horizontal plane, and the coefficient of static friction between the surfaces is 0.220. (a) What is the maximum possible static frictional force that could act on the block?_____N (b)What is the actual static frictional force that acts on the block if an external force of 25.0N acts horizontally on the block?_____N
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Of the following statements, indicate on the line whether they are true (T) or false (F):___ The friction between two surfaces can be changed by changing the masses of the objects.___ The coefficient of static friction can be less than the coefficient of kinematic friction.___ When the force of friction increases, the coefficient of friction decreases.___ The only way to change the friction between two objects is by changing their masses.___ The only way to change the friction between two objects is to polish their surfaces.___ The only way to change the friction between two objects is by changing their materials.___ The value of the friction force of a body is always constant when it is staticand does not vary with the applied force.___ When a ball strikes outside the center of gravity of a baseball bat, the ball will travelfurther than if it hit the center of gravity.___ The center of gravity of a body may be outside of it.___ The center of gravity of an object depends only on the…
Chapter 7 Solutions
Physics Laboratory Manual
Ch. 7 - For kinetic friction the direction of the...Ch. 7 - The two coefficients of friction discussed in this...Ch. 7 - Suppose a block of mass 25.0 kg rests on a...Ch. 7 - To measure the coefficient of kinetic friction by...Ch. 7 - A 5.00 kg block rests on a horizontal plane. A...Ch. 7 - Both types of coefficient of friction are...Ch. 7 - For either type of coefficient of friction, what...
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- A 200 N block is at rest on a 30° incline. The coefficient of friction between the block and the incline is 0.20. Compute the value of angle of friction and the value of a horizontal force P that will cause motion to impend up the incline. W=200 N P 30arrow_forwardA 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box?arrow_forwardA block weighs 100. N and rests on a horizontal surface. If Ms = 0.50 and uk = 0.20 between the block and the horizontal surface, then (a) What is the magnitude of the frictional force acting on the block? Justify your What is the magnitude of the frictional force acting on the block if a horizontal force of 35.0 N is now used to push the block? Justify your answer with a calculation. What is the magnitude of the minimum horizontally applied force that will start the block sliding? Justify your answer with a calculation. If the magnitude of the applied horizontal force on the block is 55.0 N, what is the magnitude of the frictional force acting on the block? Justify your answer with a calculation.arrow_forward
- A 3.7 kg book is pressed against a wall with a force P at an angle of 35 degrees above the horizontal. The coefficient of static friction between the book and the wall is 0.75. (a)What is the minimum value of the force P that can hold the book to the wall (without it sliding down)? (b)If the force is applied at an angle of 35 degrees below the horizontal, what is the minimum value of the force P that can hold the book to the wall?arrow_forwardIf the coefficient of static friction between all surfaces in contact is µg = 0.3 and a determine force P that must be applied to wedge A in order to lift the block weighing 500 N. The weight of wedge A is negligible compared to the block. B Parrow_forwardA 50.7 kg box is resting on a horizontal floor. A force of 317.1 N directed at an angle of 34.1° below the horizontal is applied to the box. The coefficient of static friction between the box and the surface is 0.5, and the coefficient of kinetic friction is 0.2. The force of friction on the box is:arrow_forward
- A tool box of weighing 50.0 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. 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?arrow_forwardA block of mass 12.0 kg rests on a horizontal plane. The coefficient of a static friction between surfaces is 0.450. What is the maximum possible static frictional force that could act on the block of a force is applied to it?arrow_forwardFrom Fig. P-014, P is directed at an angle a from x-axis and the 200 N force is acting at a slope of 5 vertical to 12 horizontal. a. Find P and a if the resultant is 500 N to the right along the x-axis. b. Find P and a if the resultant is 500 N upward to the right with a slope of 3 horizontal to 4 vertical. c. Find P and a if the resultant is zero. 12 200 N Figure P-014arrow_forward
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