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Irregular lamina with marked center-of-mass tossed in air.

What it shows:

The center of gravity fixed in (or outside) the object always orients itself with minimum potential energy on a vertical line below the support point. When an irregular shape is...

Ball shot up from PASCO cart is caught by same; a puzzler to ponder if track is tilted and cart accelerates down (or decelerates up).

Ball drops from mast of PASCO cart; its motion can be considered relative to the moving cart or the track frame of reference.

Glider acceleration by an inclined air track or by a falling weight/string attachment; large ballbearing rolling on PASCO track (with strings).

Time lapse image of a ping pong ball rolling down an inclined track. The bottom image has computer generated...