Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 7, Problem 7PLA
For either type of coefficient of friction, what is generally assumed about the dependence of the value of the coefficient on the area of contact between the two surfaces?
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A woman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. The book has a mass of m = 1.7 kg and the coefficient of static friction between her hand and the book is μs = 0.59.
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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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- Calculate the magnitude of the normal force on a 15.2 kg block in the following circumstances. The block is on a level surface and a force of 165 N is exerted on it at an angle of 40.8° above the horizontal.arrow_forwardThe coefficient of static friction between a block of mass m and an incline is = 0•3. (a) What can be the maximum angle e of the incline with the horizontal so that the block does not slip on the plane ? (b) If the incline makes an angle 8/2 with the horizontal, find the frictional force on the block.arrow_forwardA rectangular block has a length that is six times its width and a height that is three times its width. The block's surfaces are all identical except for size. When the block is placed on a horizontal tabletop so that the area in contact with the table is length ✕ width, it is found that a horizontal force of 11.6 N applied to the block is just sufficient to overcome the static friction force and cause the block to move. The block is then knocked over so that the area in contact with the table is length ✕ height. Now, what minimum horizontal force will cause the block to move?arrow_forward
- 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…arrow_forwardA block is pushed across a horizontal surface by the force shown. If the coefficient of kinetic friction between the block and the surface is 0.39, F = 45 N, 0 = 19°, and M = 2.5 kg, F M (a) What is the magnitude of the normal force, applied by the contact surface on the block, in (N)? (b) What is the magnitude of the friction force on the block in (N)? (c) What is the magnitude of the acceleration (in m/s²) of the block?arrow_forwardIn about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter with the thumb of each hand on one side and the fingers on the other side (see the figure). Sincosky's mass was 79.0 kg. If the coefficient of static friction between hand and rafter was 0.720, what was the least magnitude of the normal force on the rafter from each thumb or opposite fingers?arrow_forward
- Let's say you have two boxes made of the same material. Into one box you put a lot of weight and into the other you put a small amount of weight. You then put both boxes onto the same board and raise one end to make an incline. Should there be a difference in the measured coefficients of static friction for the two boxes? Why or why not?arrow_forwardThe magnitude of the normal force at point C is 6.8mg. The magnitude of the net force at point B is ____ mg.arrow_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_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 piece of bacon starts to slide down the pan when one side of a pan is raised up 5.0 cm. If the length of the pan from pivot to the raising point is 23.5 cm, what is the coefficient of static friction between the pan and the bacon?arrow_forwardA 1.6 kg book is pressed against a wall with a perpendicular force. The coefficient of friction is 0.25. What minimum force must be applied to the book so that is doesn’t slide down the wall.arrow_forward
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