AP Physics 1mediummcq1 pt
A 5.0 kg block is pulled by a rope at constant velocity across a rough floor. If the tension is 15 N, the kinetic friction force is
A.15 N, opposite the motion
B.50 N
C.15 N, in the direction of motion
D.35 N
Explanation
Core Concept
Constant velocity means the net force is zero, so friction balances the pull exactly.
Correct Answer
A15 N, opposite the motion
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