maximum friction force = mu m g
= .2 * .4 * 9.81 = .787 Newtons
so it is less than or equal to .787 Newtons (or .78 N if you use 9.8 for g and round to two significant figures)
A 0.40 kg block rests on a desk. The coefficient of static friction is 0.20. You push the side of the block but do not have a spring scale to measure the force you use. The block does not move. Which statement is true about the force of static friction?
It is no larger than 0.78 N.
It is 0.08 N.
It is 0.78 N.
It is no smaller than 0.78 N.
1 answer
3 answers