Question

An object of mass of 2 kg is sliding with a velocity of 4 ms -1 on a frictional horizontal surface.
The retarding force necessary to stop the object in 1 second is
(a) 2 N (b) 4 N (c) 8 N (d) 0 N

Answer 1

Answer:

Kinetic friction is a resistive force that opposes the motion of two surface objects in contact. The kinetic friction experienced by an object relies upon the normal force coming from the ground and the coefficient of the kinetic friction between the two surfaces. We can identify the kinetic friction of a system using this equation,

f

k

=

μ

k

N

where

μ

k

is the coefficient of kinetic friction and

N

is the normal force.