Penny Student - IIHS in the Classroom
ITY
1
IV
STUD
Name: Class:
T ACT
EN
MATERIALS NEEDED
For each group of 3-4
students
?? One 3"x 5" index card
?? One 10-16-ounce
plastic cup or beaker
?? 1¨C10 pennies
?? OPTIONAL: additional
mix of dimes, nickels,
quarters, and half
dollars
Per Student
?? One copy of the
¡°Penny for Your
Thoughts¡± Student
Activity Sheet
Date:
UNDERSTANDING CAR CRASHES: IT'S BASIC PHYSICS ACTIVITY
PENNY FOR YOUR THOUGHTS ON INERTIA
Key Question
?? How is a magician¡¯s tablecloth trick similar to a crash
dummy falling off the tailgate of a pickup truck as the
truck accelerates?
Did You Know?
Whether you are attempting the magician¡¯s tablecloth
trick or slamming on your car brakes to avoid an
accident, the laws of physics apply.
Understanding the physical laws of motion can help
improve your chances of success in either situation and
could even save your life someday!
Procedure
1. Cover the cup with the index card and center the penny above the cup on top of
the card (See Figure 1).
2. Try to figure out how to get the penny into the cup without lifting the card and only
touching the card with one finger.
3. After each group member has succeeded with one penny, try it with a stack of
multiple pennies and/or other coins.
Analysis Questions
1. Describe the successful technique you used.
2. Why does the penny drop in the cup when the card is ¡°flicked¡± away?
classroom.
21
1
UNDERSTANDING CAR CRASHES: IT'S BASIC PHYSICS ACTIVITY
ITY
STUD
T ACT
IV
EN
PENNY FOR YOUR THOUGHTS ON INERTIA
Analysis Questions (continued)
3. How did the total mass of the coins used affect your success?
(HINT: How are ¡°mass¡± and ¡°inertia¡± related?)
4. How does this activity illustrate Galileo¡¯s Principle of Inertia and Newton¡¯s First Law
of Motion?
5. Should magicians select lighter or heavier dishes for their tablecloth trick? Why?
Key Question 2
How is the magician's tablecloth trick similar to a crash dummy falling off the tailgate
of an accelerating pickup truck?
classroom.
22
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