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
1) zero.
2) 100 N.
3) 1000 N.
4) greater than 1000 N.
In this case the pushing force and the friction force are
5) equal but oppositely directed.
6) an action-reaction pair.
7) both of these.
8) none of these.
Answer: 2, 5
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