Balance the bar with the three weight on the inside.
If you were to set the X weight to 2 what do you think the angle might be?
Attach weights of 1, 2, 4, and 8 units to the four attachment points on the bar. Move the bar from side to side until you find a balance point. Is it possible to predict that position?
A ball whooshes down a slide and hits another ball which flies off the slide horizontally as a projectile. How far does it go?
Whirl a conker around in a horizontal circle on a piece of string. What is the smallest angular speed with which it can whirl?
A cone is glued to a hemisphere. When you place it on a table in what position does it come to rest?