Investigate Galileo's claim that after a fall of 100 meters an ebony (dark wood) ball and a lead ball would be separated by less than 4 inches. In fact, approximately how far apart are they in meters when the first hits the ground? Take each ball to have a radius of 1 cm.

5 meters 
25 meters
50 meters
80 meters

Use the timer on top of the tower to estimate the terminal speed of a 1 cm wood ball. You can stop the timer at any time by clicking on the tower.

1 m/s 
5 m/s 
10 m/s
15 m/s

Which wood ball has the geatest terminal speed?
1 cm
2 cm
4 cm

How does the time of fall of the 4 cm lead ball correspond to that of an object falling in a vacuum through 100 meters?
Within 0.5 seconds
1.5 seconds longer 
Two seconds longer

The young Galileo claimed that objects of the same densities but different sizes would fall together. Does the simulation support this contention?
Actually Galileo specified that the density should be calculated using the weight in air.
Yes
No 

What about the young Galileo's contention that the speed of fall of objects should be proportional to their density. Is this contention supported?
At the time Galileo believed that after a short period of acceleration most of the fall was at constant speed.
Mostly    
Not at all

In "Two New Sciences" Galileo claims a one hundred pound and a one pound iron ball falling through 100 cubits (about 50 meters) would be separated by less than cubit. Is this contention supported?
Note: If the 1 cm iron ball weighed 1 pound the 4 cm one would weigh 64 pounds.
No 
Yes