A heavy crate is pushed steadily but does not budge. Which force is opposing the push?
AKinetic friction
BNormal reaction
CStatic friction
DApplied tension
Answer & Solution
Correct answer: C. Static friction
1. Friction opposes motion and acts parallel to the surface the object rests on.
2. Static friction acts while the object is still stationary, and kinetic friction acts while it is moving.
3. The crate has not moved, so the friction acting on it is static friction.
4. Static friction can grow until it reaches a maximum value, after which the crate finally slides.
_Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 2: Newton's laws_
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