Question

Is the magnitude of normal force always equal to frictional force? If
not, justify your answer with examples.
Whose coefficient of friction will be more? Used sandpaper or unused sandpaper? Why​

Answer 1

Answer:

1. Physics I For Dummies, 2nd Edition

According to the laws of physics, the force of friction, Ffriction, always acts to oppose the force you apply when you try to move an object. ... The normal force isn't necessarily equal to the force due to gravity; it's the force perpendicular to the surface an object is sliding on.

2. I  found that if you drag a wooden block across a piece of 150 grit sandpaper, there is more friction than if you do the same with a piece of 50 grit sandpaper. Why is this? I tried to find an answer on the Internet, but they were not specific enough.

Explanation:

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