#$&*

course PHY 241

11/13 11

PhET EstimationI chose the option

area/volume, x being the number you entered.

This area also offers strategy and rules.

The ""Play"" area will show two shapes of similar appearance, but of different sizes. You must then choose how many of the smaller object it

takes to make the larger object. You are timed, and answers are considered ""close enough"" if within a certain range of the exact answer.

I played it for a few minutes, and was surprised by some of them, and by my now-apparent lack of estimation skill. Definitely a valuable tool

for training the use of visual perception to make inferences about size and position."