alleryThe force of friction acts in a direction:
AAlways perpendicular to the direction of motion
BAlways in the direction of the applied force
CSame as gravity, always pointing downward
DOpposite to the direction of motion or attempted motion
Answer & Solution
Correct answer: D. Opposite to the direction of motion or attempted motion
Friction always opposes motion (or attempted motion) between two surfaces in contact.
That's why pushing a heavy box requires extra force to overcome friction before motion begins.
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