The cow above has some bad roller skates with a lot of dirt in the bearings which generates a lot of friction.
Determine the minimum angle at which the cow slides. What is this angle and how long does it take the cow to slide down to the bottom?
By determining the minimum angle needed for the cow to move, what quantity in this system have you measured?
Look at the cow about 1/2 way down its sliding path - what is the relation between the red and blue vectors (that is, is one larger than the other, or are they of similar size). What does the difference in size, if any, between the red and the blue vectors physically mean?
Now reduce mass of the cow to 20 units. Do you think it will take longer or shorter to slide down the incline at the same angle? Test your assumption.
Finally, note the nature of the X vs Time and Y vs Time diagrams. Why are they curved instead of straight as in the case of the cow on rollerskates example done earlier?