Push a block with 20 N: is the friction 50 N? A 10 kg block rests on a floor with a coefficient of static friction of 0.5, and g = 10 m/s^2.
The normal force is N = mg = 100 N, so the most static friction can give is 0.5 x 100 = 50 N. Push with 20 N and the block stays at rest, so the forces balance: friction is 20 N, not 50 N. Push harder and friction grows with the push, until at 50 N it reaches its limit.
Static friction matches the push, up to its limit of 0.5 x 100 = 50 N here. At the end, your turn: one question on a box and a 20 N push.
Free notes with a solved example, practice questions and the worked answer to the quiz: jeevisionx.com, under Shorts.
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Your turn: a box starts sliding at a 50 N push. You push it with 20 N. The friction is:
A) 20 N
B) 50 N
C) 0 N
Comment A, B or C.
The worked answer is in the free notes: jeevisionx.com, under Shorts.