# Frictionless incline plane hw help

1. Oct 15, 2009

### inedhelpinphy

Frictionless incline plane hw help!!!!!

1. The problem statement, all variables and given/known data

An object is on a frictionless inclined plane. The plane is inclined at an angle of 78.0 degrees with the horizontal. Using the accerlation due gravity from your reference table. What is the magnitude of object's acceleration?

2. Relevant equations
a= delta v/ t or g=F^g/ m or vf=vi+at or d= vit+1/2at^2 or vf^2=vi^2+2ad

3. The attempt at a solution
a= delta v/ t

2. Oct 16, 2009

### gabbagabbahey

Re: Frictionless incline plane hw help!!!!!

Hi inedhelpinphy, welcome to PF!

Draw a picture!...What forces (there is more than one!) act on the object? What are their magnitudes and direction? What is the magnitude and direction of the net force on the object? What does Newton's second law tell you?

3. Oct 16, 2009

### logickills

Re: Frictionless incline plane hw help!!!!!

The first thing you undoubtedly need to do is to draw a free body diagram. You should get in the habit of this being the first step. Like Gaba said look into Newton's Second Law.

If you continue to have trouble check out this link
http://www.sparknotes.com/testprep/books/sat2/physics/chapter8section3.rhtml