AP Physics 1mediummcq1 pt
A 5.0 kg block is pushed along a horizontal floor at constant speed by a horizontal 20 N force. The magnitude of the kinetic friction is
A.20 N
B.less than 20 N
C.50 N
D.zero
Explanation
Core Concept
Constant velocity means zero net force, so friction equals the applied force.
Correct Answer
A20 N
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