Practice Questions
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If a 10 kg block is sliding across a horizontal surface with a coefficient of kinetic friction of 0.3, what is the kinetic frictional force acting on the block?
The kinetic friction equals the friction coefficient times the normal force. Other options are incorrect because This choice assumes a much smaller fr...
If a car is moving on a road and the coefficient of static friction between the tires and the surface is 0.7, what does this value indicate about the car's ability to start moving?
A coefficient of 0.7 means the tires have strong grip. Other options are incorrect because One might think that a high static friction makes it imposs...
A 5 kg block is placed on a ramp inclined at an angle of 30 degrees. What is the maximum static frictional force that can act on the block if the coefficient of static friction between the block and the ramp is 0.4?
The maximum static friction can only be as large as the product of the coefficient of static friction and the normal force. Other options are incorrec...
How does surface roughness influence the frictional interaction between two materials?
A rougher surface has many bumps and valleys. Other options are incorrect because The idea that smoother surfaces always give more friction is a mista...
A 15 kg box is resting on a ramp inclined at 40 degrees. If the coefficient of static friction between the box and the ramp is 0.5, what is the maximum angle of inclination at which the box can remain at rest without sliding down?
Static friction can keep the box in place as long as the downhill pull is no bigger than the friction force. Other options are incorrect because Assum...
You are conducting a physics demonstration where you need to slide a heavy block across a surface with minimal resistance. You decide to use a gas to reduce friction. Which of the following methods would be most effective in demonstrating the principles of reduced friction using gas?
The gas that comes out of the CO2 container spreads over the block and the surface, forming a thin layer that keeps them apart. Other options are inco...
How does the introduction of gas in a friction behavior demonstration affect the motion of an object on a flat surface?
Adding gas creates a thin layer that sits between the two surfaces. Other options are incorrect because Some think gas adds weight to the object, but ...
Friction Behavior Demonstration: Gas film effects are to reducing friction as ___ is to enhancing fluid flow.
When an object has a smooth, curved front it lets the surrounding fluid glide past with little push. Other options are incorrect because Some think th...
Order the steps involved in the Friction Behavior Demonstration using carbon dioxide to minimize friction.
Adding carbon dioxide to the container forms a thin gas film on the bottom surface. Other options are incorrect because Some think letting the gas esc...
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