High School Physics Aid » Forces » Specific Forces » Understanding Frictional Force

Susan is trying to push a 

*
 cprice across the floor. She observes that the pressure of friction between the cprice and also the floor is 
*
. What is the coreliable of static friction?

*


*


*



*


Correct answer:


Explanation:

The equation for the force of friction is

*
, where 
*
 is the coeffective of static friction.

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The normal pressure is equal to the mass times acceleration because of gravity, yet in the opposite direction (negative of the force of gravity).

*

*

*

*

Due to the fact that the trouble tells us that the pressure as a result of friction is 

*
, we deserve to plug these values right into our original equation to resolve for the coeffective of friction.

*

*

*

*

The coreliable of friction has no units.


Mary is trying to push a 

*
 crate across the floor. She observes that the coeffective of static friction in between the floor and the cprice is equal to
*
. What will certainly be the force of friction on the crate?

*


Explanation:

The equation for the pressure of friction is

*
, where 
*
 is the coefficient of static friction.

The normal force is equal to the mass times acceleration because of gravity, yet in the opposite direction (negative the pressure of gravity).

*

*

*

*

Because the difficulty tells us that the coeffective due to friction is equal to 

*
, we deserve to plug these worths right into our original equation to deal with for the force.

*

*

*

As the pressure because of friction is moving in the OPPOSITE direction to the force Mary will exert, it need to accordingly be labelled as negative.

 

*


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Example Concern #3 : Understanding Frictional Force


*
 crate slides throughout a floor for 
*
 before coming to rest 
*
 from its original place.


What is the coefficient of kinetic friction on the crate?

*


Possible Answers:
Correct answer:

*


Explanation:

The equation for the pressure due to friction is 

*
, where 
*
 is the coreliable of kinetic friction. Because there is only one pressure acting upon the object, the pressure due to friction, we can uncover its worth utilizing the equation 
*
. We can equate these two pressure equations, interpretation that 
*
. We can solve for the normal pressure, yet we must find 
*
 in order to find 
*
.

The problem gives us the mass of the crate, but we have to solve for the acceleration.

Start by finding the initial velocity. The problem gives us distance, final velocity, and adjust in time. We have the right to usage these worths in the equation below to fix for the initial velocity.

*

Plug in our offered values and settle.

*

*

*

*

We deserve to use a straight motion equation to fix for the acceleration, making use of the velocity we simply uncovered. We now have actually the distance, time, and initial velocity.

*

Plug in the given values to settle for acceleration.

*

*

*

*

*

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Now that we have the acceleration and the mass, we deserve to return to our first equation for pressure.

*

The normal pressure is the same as the mass times gravity.

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*

In this format, the masses cancel on both sides of the equation/

*

Now we have the right to plug in our value for acceleration and also gravity to solve for the coeffective of friction.