AP Physics 1· difficulty 2/5
A box is pulled across a floor by a rope at above the horizontal. Compared to pulling horizontally with the same tension, the angle reduces friction because
It decreases the normal force.
It increases the normal force.
Friction is unaffected by direction.
It changes the box's weight.
Explanation
The vertical component of tension lifts the box slightly, reducing the normal force and thus reducing kinetic friction ().
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