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Which statement is correct about the weight of an object and the force of kinetic friction on that object? (A) The weight is always greater than the frictional force. (B) The weight is always equal to the frictional force. (C) The weight is less than the frictional force for sufficiently light objects. (D) The weight can be more or less than the frictional force.

Which statement is correct about the weight of an object and the force of kinetic friction on that object?
(A) The weight is always greater than the frictional force.
(B) The weight is always equal to the frictional force.
(C) The weight is less than the frictional force for sufficiently light objects.
(D) The weight can be more or less than the frictional force.

Grade:upto college level

1 Answers

Deepak Patra
askIITians Faculty 471 Points
8 years ago
(A)The weight is always greater than the frictional force.
The kinetic force of friction is given as:
fk = μkN
Here, μk is the coefficient of kinetic friction, and N is the magnitude of normal force.
It is important to note that when a block rest on a horizontal surface, the normal force acting on it is equal to its weight W such that.
fk = μkW
However, if the block is kept on an inclined surface at inclination θ then the normal force balance the component of weight perpendicular to the inclined surface, which is W cosθ. Therefore,
233-1046_1.PNG
Therefore, (A) is the correct option while the rest are ruled out.

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