Basic kinetic friction and mass quesion?

In summary, kinetic friction is a type of force that occurs when two objects slide against each other, and it acts in the opposite direction of motion. The magnitude of kinetic friction is determined by the coefficient of friction, which is affected by the materials and surface conditions of the objects in contact. Mass does not directly affect the magnitude of kinetic friction, but it can impact the force needed to overcome it. Heavier objects may require more force to overcome kinetic friction than lighter objects.
  • #1
nchin
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An object of mass M is pulled along a rough floor for some time. An additional mass m is then placed on M and is pulled along the same floor as shown.

(The picture is just a square with mass M and a small square right on top of it with mass m)

What effect does the addition of mass m have on the force of kinetic friction between the floor and mass M?

a. The force of kinetic friction increases.
b. The force of kinetic friction decreases.
c. The force of kinetic friction becomes zero.
d. The force of kinetic friction stays the same.

im leaning more towards a because isn't the more mass an object has, the more kinetic friction it will produce?

also same question except what will happen to the coeffecient of kinetic friction?

a. The coeffecient of kinetic friction increases.
b. The coeffecient of kinetic friction decreases.
c. The coeffecient of kinetic friction becomes negative.
d. The coeffecient of kinetic friction stays the same.

what is the definition of coeffecient of kinetic friction?
 
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  • #3
nchin said:
An object of mass M is pulled along a rough floor for some time. An additional mass m is then placed on M and is pulled along the same floor as shown.

(The picture is just a square with mass M and a small square right on top of it with mass m)

What effect does the addition of mass m have on the force of kinetic friction between the floor and mass M?

a. The force of kinetic friction increases.
b. The force of kinetic friction decreases.
c. The force of kinetic friction becomes zero.
d. The force of kinetic friction stays the same.

im leaning more towards a because isn't the more mass an object has, the more kinetic friction it will produce?
You have some equation/s to support this thinking?

what is the definition of coeffecient of kinetic friction?
Try wiki, spelling it "coefficient".
 

1. What is kinetic friction?

Kinetic friction is the force that opposes the motion of an object when it is in motion.

2. How is kinetic friction different from static friction?

Kinetic friction occurs when an object is already in motion, while static friction occurs when an object is at rest and about to be put into motion.

3. What factors affect the amount of kinetic friction?

The amount of kinetic friction is affected by the type of surfaces in contact, the force pressing the surfaces together, and the roughness of the surfaces.

4. How does mass affect kinetic friction?

Mass does not directly affect kinetic friction. However, a heavier object may experience more kinetic friction if it is being pushed or pulled with a greater force.

5. How can the amount of kinetic friction be reduced?

The amount of kinetic friction can be reduced by using lubricants between the surfaces, smoothing out the surfaces, or reducing the force pressing the surfaces together.

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