Some advice: The task in this exercise is to draw all force vectors in the free-body digram for the mass m.
To do this, click on a forces on the lower left, which you believe to be present in this free-body diagram.
Then you can draw a force vector by clicking somewhere on or near the mass and dragging the cursor. The cursor location
determines the endpoint of the vector, and the starting point of the vector is automatically the center of the mass.
Concentrate on the direction of the force vectors only; the lengths of the vectors will be determined through calculations
after the free-body diagram is constructed. Assume for now that mass m is sliding up the incline.
A vector is counted as correct, if its angle is within ±5° of the exact answer. If you click once on the "Check My Work"
button, we display your total score; if you click again, you also see which vectors have the correct angles; if you click a third
time, we show you the full answer. "Reset" will allow you to erase everything and start over. Hint: the angle
θ = 22o.
Note: You can also construct the free-body diagram for the case that mass m is sliding down the incline.
© W. Bauer and G.D. Westfall, 2013