1. Before start, you can drag the block to a new position. You can modify the angle and the height of the incline by dragging the two red crosses appearing at its two ends. Once the motion has begun, such changes are not allowed.

2. After start, you can view "forces acting on the object" or " velocity, acceleration vectors" alternately by clicking the incline.

3. A rectangle with dimensions displayed simultaneously is dragged out from a point when the "Control" key is pressed . This rectangle is used for length measurements.

W: width; H: height; D: diagonal

4. The mass of the object is 1 kg. It rebounds elastically or stops at the lower end of the track.

5. The potential energy is zero on the ground level.

6. The static coefficient of friction and the kinetic coefficient of friction of all surfaces are assumed to be the same.