- 19

- 0

**1. Homework Statement**

A student pulls on a rope attached to a box of books and moves the box down the hall. The student pulls with a force of 185N at an angle of 25.0 degrees above the horizontal. The box has a mass of 35.0kg and a mu between the box and the floor is 0.27. Find the acceleration of the box.

**2. Equations:**

Ff=muFn

FG=mg

sum of Ftx=Ftx+Ff=ma

sum of Fy= Fn+Fpy-Fg=0

Ftx=Ft cos 25 degrees

Fty= Fy sin 25 degrees

**3. The Attempt at a Solution**

In class we drew a picture and wrote out many, many equations that we are supposed to use to solve the problem. Each equation is supposed to help us solve another equation. I am very confused. Does anyone know another way to solve this problem or explain it differently. I have written down 168N-71.5/35kg and got 2.75 which from what my teacher says is the correct answer. I can not remember how I did it and don't know if what I did is correct.