A horizontal 100-N force exerted against a 1000-N block causes the block to slide on a level surface with constant velocity. The friction force on the block must be
A)zero.
B)100 N.
C)1000 N.
D)greater than 1000 N.
In this case the pushing force and the friction force are
E)equal but oppositely directed.
F)an action-reaction pair.
G)both of these.
H)none of these.

Question

Quizplus · Accepted Answer

The friction force must be 100 N to balance the 100-N pushing force, ensuring the block moves with constant velocity. This means the forces are equal in magnitude but opposite in direction, indicating they are equal but oppositely directed.

A Horizontal 100-N Force Exerted Against a 1000-N Block Causes