Because of friction, a constant force of 20 N is needed to slide a box across a room to the right at a constant speed:
a) How many Newtons must the friction force be?
b) How much work is done by the friction force?
c) How much work is done by gravity?
d) How much work is done by the normal (upward) force?
e) What is the net work done?
- Let us consider the forces come into picture in the above case,
i. Applied force, Fa - contact force in the direction the object is moving
ii. Normal force, Fn - Caused by a surface
iii. Friction Fr - opposes the motion of objects, must have contact
iv. Force of gravity , Fg - due to gravity.
- consider the free body diagram
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