Posted by **Bella** on Friday, February 20, 2009 at 4:46pm.

There are six books in a stack, and each book weighs 5 N. The coefficient of static friction between the books is 0.2. With what horizontal force must one push to start sliding the top 5 books off the bottom one.

my answer is 3N but i don't think that's right.

does anyone know what the answer is ..?

- Physics -
**Damon**, Friday, February 20, 2009 at 5:03pm
five books weigh 25 N

.2 *25 = 5N

- Physics -
**bobpursley**, Friday, February 20, 2009 at 5:04pm
Aren't there five books on top, so the normal force is 25N?

Friction=mu(normal force)

- Ap Physics -
**Nick**, Thursday, December 18, 2014 at 11:21pm
3 N

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