**INERTIA**

Monegain, Louise J. Park Manor

1-312-962-2670

**Objectives**
1) Students will learn basic understanding of inertia.
2) Students will demonstrate some activities illustrating inertia.
3) Students will develop a basic understanding of Newton's laws of motion.
**Apparatus Needed**
Balls various sizes, pie pans with one fourth slice removed, pennies, heavy paper
circle, checkers, skate board, stuffed animal, glass, two eggs (one boiled, one raw),
cloth napkin, glass of water and straws.
**Recommended Strategy**
Students should have prior knowledge of speed, force, acceleration, gravity and
friction. Demonstrate inertia by snatching a cloth napkin from under a glass of
water, and a paper circle from under a checker so that the checker falls into the
glass and spinning the two eggs. Group students into cooperative groupings to carry
out the following activities:
Activity 1 - Place a ball in the pie pan and spin the ball. Repeat this activity
using two balls of different mass.
Activity 2 - Put a ball in motion and try to blow it off of its path with a straw.
Repeat this activity using balls of various masses.
Activity 3 - Stack five checkers one on top of the other. Using your fore-finger
flick another checker sharply against the bottom checker of the stack to move it from
pile keeping pile undisturbed.
**Summary**
Discuss Newton's first law of motion with students. Have students answer these three
questions: 1) How does the pie pan and ball activity help prove the first law of
motion? 2) Which ball was the hardest to move off of the straight path? 3) Does
inertia increase with mass?

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