# Homework Help: Kinetic friction and things

1. Sep 11, 2006

### Lmbrando

Hi I need help on my homework and i have no idea where to start and my teacher gives us webassign problems but he does not teach us how to do them, he just gives us formulas.. If anyone can help me with at least this problem i'd appreciate it thx

p.s im struggling help!!

A 1400 N crate is being pushed across a level floor at a constant speed by a force of 300 N at an angle of 20.0° below the horizontal, as shown in Figure P4.37a.

(a) What is the coefficient of kinetic friction between the crate and the floor?

(b) If the 300 N force is instead pulling the block at an angle of 20.0° above the horizontal as shown in Figure P4.37b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in (a).
m/s2

2. Sep 11, 2006

### Hootenanny

Staff Emeritus
Hi there Lmbrando and welcome to PF,

Have you any thoughts on the matter thus far?

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