Practice Questions
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When a block of metal is initially at rest on a heated surface, what effect does increasing the temperature have on the static friction coefficient compared to the kinetic friction coefficient once the block starts sliding?
Heat makes the metal surface softer, so the static friction drops faster than the kinetic friction. Other options are incorrect because People often t...
How does the texture of a surface influence the amount of friction experienced when two materials are in contact with each other?
Rough surfaces have many bumps. Other options are incorrect because People think smoother surfaces trap more stuff, but actually they let parts slide ...
Which of the following statements best describes how increasing the normal force affects the frictional force between two surfaces in contact?
The normal force is the push that keeps the two surfaces pressed together. Other options are incorrect because Some think a heavier load doesn’t chang...
When measuring the frictional forces between a rubber tire and a wet road, how would the static and kinetic friction coefficients likely compare if the temperature of the tire increases due to prolonged braking?
Heat makes rubber softer and less sticky. Other options are incorrect because The belief that a hotter tire would keep static friction same while kine...
How does an increase in temperature affect the friction coefficient of a polymer-based material compared to a metal-based material?
When a polymer is heated, its chain structure relaxes and the material softens. Other options are incorrect because The belief that all materials reac...
How does increasing surface roughness affect the friction coefficient between two sliding surfaces?
When a surface is rough, it has many bumps and valleys that can lock into the other surface. Other options are incorrect because Some think a rougher ...
How does increasing the surface roughness of two sliding objects affect their friction coefficient on an incline?
When a surface gets rougher, its bumps and grooves fit together more tightly. Other options are incorrect because The misconception is that smoother s...
If a block of wood slides down an incline and experiences lower friction than expected, what could be a likely cause for this observation?
A smoother surface has fewer bumps that the wood can grip. Other options are incorrect because Some students think that a heavier block slides easier ...
A toy car is placed on a wooden plank that has a rough surface. If the car is pushed gently, it slides down the plank due to gravity. Which factor primarily affects how far the car will slide before coming to a stop?
The surface roughness determines how much friction force pushes against the car. Other options are incorrect because Many think color changes friction...
Surface roughness:Coefficient of friction :: Surface area:?
Sliding resistance coefficient describes how much force is needed to keep two surfaces sliding. Other options are incorrect because Static resistance ...
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