Constant speed and friction ()

In summary, the question asks for the coefficient of kinetic friction between a box filled with physics books (31 kg) and the floor as it is pushed at a constant speed by a force of 85 N at an angle of -40 degrees. The force is necessary to oppose the friction and maintain the constant speed, as well as affect the normal force, which is needed to calculate the coefficient of kinetic friction.
  • #1
Demonsthenes
7
0
Okay, here's the question:

A box full of physics books (31 kg) is pushed across the floor at a constant speed by a force of F = 85 N at an angle theta = -40 degrees. Determine the coefficient of kinetic friction between the box and floor.

My question is (for later calculation) if the box is moving at constant speed, does the F = 85N really matter?
 
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  • #2
Absolutely - that force (the horizontal component...) is what opposes the friction to keep the speed constant.
 
  • #3
That force also affects the normal force, which you'll need to figure out to calculate the coefficient of kinetic friction.
 

What is constant speed?

Constant speed is the rate at which an object travels without any changes in its velocity. This means that the object is moving at a steady pace and covering equal distances in equal amounts of time.

What is friction?

Friction is the force that opposes motion between two surfaces that are in contact with each other. It is caused by the microscopic irregularities on the surfaces of objects, which create resistance and make it difficult for them to slide past each other.

How does friction affect constant speed?

Friction acts in the opposite direction of motion, so it can slow down an object that is moving at a constant speed. This is because the frictional force creates resistance against the object's motion, requiring more energy to maintain the same speed.

Can constant speed be achieved without friction?

Yes, constant speed can be achieved without friction in a vacuum, where there is no air or any other medium to create resistance against the object's motion. In this case, there is no force acting against the object to slow it down, allowing it to maintain a constant speed.

How can we reduce friction?

Friction can be reduced by using lubricants, such as oil or grease, between two surfaces in contact. This helps to smooth out the microscopic irregularities and reduce the resistance between the surfaces. Additionally, using materials with lower coefficients of friction or adding wheels or rollers can also reduce friction.

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