# Homework Help: Acceleration down an inclined plane

1. Mar 14, 2015

### Worfie

• User informed about mandatory use of template in homework forums.
Hello,

After collecting data for the classic physics experiment - motion down an inclined plane, I assembled my graph, and found something startling; in my graph, acceleration is proportional to mass (use the attached file for reference).

Theoretically, my graph should resemble the inverse, by a ∝ 1/m.

Can anyone explain possible reasons for this?

The experiment was running a margarine container down a wooden slope, varying the mass of the margarine container by adding brass weights each time.

#### Attached Files:

• ###### Mass versus acceleration.png
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2. Mar 14, 2015

### Orodruin

Staff Emeritus
What makes you think so?

3. Mar 14, 2015

### Worfie

F=ma, therefore a=F/m, which implies as the mass increases, acceleration decreases.

4. Mar 14, 2015

### Orodruin

Staff Emeritus
What is F in your case?

5. Mar 14, 2015

### Worfie

F=mg(sinθ-cosθ)

where θ is the angle of the inclined plane.

This is the net force of the block down the plane.

6. Mar 14, 2015

### Orodruin

Staff Emeritus
And inserting this into your expression for the acceleration gives?

Edit: you are also missing a friction coefficient...