What is the frictional force on a 25-N object sliding along a horizontal surface at constant speed if the coefficient of kinetic friction is 0.40?
Options
A
10 N
B
25 N
C
2.5 N
D
100 N
Answer & Analysis
Answer
A
Analysis
To find the frictional force acting on the
object sliding at a constant speed, we can use the formula for kinetic
friction:
Where:
is the frictional force.
is the coefficient of kinetic
friction.
is the normal force.
1. Determine the normal force ():
Since the object is on a horizontal surface
and there are no vertical forces acting on it other than its weight, the normal
force is equal to the weight of the object:
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