Practice Questions
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If a 10 kg box is resting on a flat surface with a coefficient of friction of 0.5, what is the maximum frictional force that can act on the box before it starts to slide?
Friction grows until it equals the coefficient of friction times the normal force. Other options are incorrect because 100 N doubles the weight, but t...
When attempting to push a stationary object across a surface, which factor is most crucial in determining whether the object will start to move?
The amount of static friction decides how much push is needed. Other options are incorrect because Weight only pulls the object down; The size of the ...
In the design of a new roller coaster, engineers must consider the coefficient of friction between the coaster wheels and the tracks. If the coefficient of static friction is 0.6 and the total weight of the roller coaster is 5000 N, what is the maximum force of static friction that can be exerted before the coaster starts to slide?
Static friction is the product of the friction coefficient and the normal force, which equals weight here. Other options are incorrect because Some th...
If the temperature of a surface increases significantly, how would this most likely affect the normal force and the frictional force acting on an object resting on that surface?
The normal force is set by the object's weight and gravity; it does not change when the surface gets hotter. Other options are incorrect because Some ...
When a 15 kg block is placed on a rough surface where the coefficient of kinetic friction is 0.4, how does a significant increase in surface temperature affect the normal force and the friction acting on the block?
The block’s weight is 15 kg × 9.8 m/s², so the normal force stays at 147 N even when the surface gets hot. Other options are incorrect because Some th...
Static friction : Weight :: Kinetic friction : ?
Kinetic friction is mainly set by how rough the two surfaces are. Other options are incorrect because Speed of sliding does not decide how much kineti...
A block is placed on a surface and begins to slide when a force of 270 grams is applied. How would you classify the type of friction acting on the block at this moment?
When the block starts to move, the contact force changes to a force that opposes motion. Other options are incorrect because The idea that the block i...
If an object is resting on a surface and begins to slide at a weight of 270 grams, what can you infer about the static friction coefficient between the object and the surface?
Static friction coefficient is the maximum static friction force divided by the normal force. Other options are incorrect because The idea that fricti...
If an object begins to slide down a surface at a weight of 270 grams, what could be the underlying reason for this change in motion in terms of friction forces?
The object starts moving when the downward pull from gravity is stronger than the maximum static friction that keeps it still. Other options are incor...
Master Friction Forces Analysis (Part 3)
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