Home 2.3 Kai and Maile: Penny Fingers

Warning: Creating default object from empty value in /home/johnchem/public_html/components/com_k2/models/item.php on line 511

2.3 Kai and Maile: Penny Fingers

 

 

SUMMARY

Kai shows Maile how the composition of a penny changed after 1982 and how the differences in mass can be detected by noting the differences in inertia. Duration 2:53.

 

VIDEO CHECK QUESTIONS

2.3a Why did Maile move her hands as she was trying to determine which penny on her fingers was heavier?
2.3b What metal is used to fill the inside of pennies manufactured after 1982?
2.3c Kai says, "What you're doing is you're measuring inertia--what it takes to lift that penny." Why would it have been better of him to have said "...what it takes to MOVE that penny"?

All video check questions can be downloaded from the EXTRAs menu.