7. Friction, Inclines, Systems
Kinetic Friction
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- Multiple Choice
Pushing a 10-kg toolbox across the floor, you find that the box moves at a constant speed when you push horizontally with a force of 39 N. What is the coefficient of kinetic friction between the floor and the toolbox?
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You push on a 3-kg box to give it an initial speed of 5 m/s across a floor. If μk = 0.3, how far does the box travel before coming to a stop?
1301views32rank3comments - Multiple ChoiceBlock A, mass , sits on top of block B, mass . The coefficients of static and kinetic friction between blocks A and B are 0.34 and 0.23, respectively. Block B sits on a frictionless surface. What is the maximum horizontal force that can be applied to block B, without block A slipping?520views1rank
- Textbook Question
In a laboratory experiment on friction, a -N block resting on a rough horizontal table is pulled by a horizontal wire. The pull gradually increases until the block begins to move and continues to increase thereafter. Figure E shows a graph of the friction force on this block as a function of the pull. Identify the regions of the graph where static friction and kinetic friction occur.
1526views - Textbook Question
A box of bananas weighing N rests on a horizontal surface. The coefficient of static friction between the box and the surface is , and the coefficient of kinetic friction is . If the monkey applies a horizontal force of N, what is the magnitude of the friction force and what is the box's acceleration?
656views - Textbook Question
A box of bananas weighing N rests on a horizontal surface. The coefficient of static friction between the box and the surface is , and the coefficient of kinetic friction is . What minimum horizontal force must the monkey apply to keep the box moving at constant velocity once it has been started?
688views - Textbook Question
A -kg crate of tools rests on a horizontal floor. You exert a gradually increasing horizontal push on it, and the crate just begins to move when your force exceeds N. Then you must reduce your push to N to keep it moving at a steady cm/s. What push must you exert to give it an acceleration of m/s2?
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