Basic kinetic friction and mass quesion?

AI Thread Summary
The addition of mass m to object M increases the force of kinetic friction between M and the floor, as greater mass results in greater frictional force. The coefficient of kinetic friction, however, remains constant regardless of the mass added, as it is a property of the surfaces in contact. The coefficient is defined as the ratio of the force of friction to the normal force acting on the object. Users are encouraged to reference external resources for further clarification on these concepts. Understanding these principles is essential for analyzing motion on rough surfaces.
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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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".
 
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