Author Question: The demonstration in this figure is often shown as a magician's trick. What in fact is the trick? a. ... (Read 70 times)

sabina · **on:** Jul 28, 2018

The demonstration in this figure is often shown as a magician's trick. What in fact is the trick?
a. When the magician yanks the tablecloth rapidly, the inertia of the dishes prevents them from accelerating significantly during the short time the force of friction from the moving tablecloth acts.
b. The magician uses magnets or some other external device to keep the dishware in place.
c. The tablecloth has almost zero mass, or inertia. Hence, it is easy to pull away from the dishware.
d. The mass of the tablecloth prevents it from accelerating rapidly enough to exert much force on the dishes.
e. The dishes have much less inertia than the tablecloth.

Question 2

In Galileo's thought experiment about rolling balls, Galileo argued that:
a. a ball rolling up the tilted surface speeds up.
b. a ball rolling down the tilted surface slows down.
c. a ball rolling on a level surface speeds up.
d. a ball rolling on a the level surface continues at the same speed.
e. a ball rolling on a level surface slows down.