1. The problem statement, all variables and given/known data A wooden box is at rest on a ramp inclined at an angle Ө to the horizontal. W is the weight of the box and its contents. A frictional force prevents the box sliding down the ramp. A reaction force acts on the box perpendicular to the inclined plane. The inclined plane is hinged at its lower end so that it can be easily lifted to alter the angle Ө. Describe how you would investigate the relationship between W and the angle, Өs, at which the box just starts to slide down the ramp. Image is attached. 2. Relevant equations I don't feel equations are need, except perhaps possibly the resolved components of W. These being mgsinӨ (the component of weight parallel to the slope), and mgcosӨ (the component of weight perpendicular to the slope). Very unlikely that F = µR will be needed. 3. The attempt at a solution I've been told I need to consider the following: What measurements do I need to take (i.e. what are my x and y variables)? What measuring instruments shall I require to make these measurements? State an appropriate range and interval for my independent axis. Plot a graph of y variable against x variable. Conclude what the results would look like, and what they represent/theorise. I think my independent variable is Ө, and I could measure this using a protractor. I could use intervals of 10°, and take a range of 10° to 80°. My main problem is not being sure what my dependent variable would be, as without knowing that I can't state what my plotted graph would be or even begin to think what it would look like plotted and theorise. Help would be appreciated! Thanks!