Yamang Lupa

Activity No. 1: Ball Bounce Experiment

Materials for the Ball Bounce Experiment:

* A basketball or soccer ball, or similar bouncy ball

* a smaller bouncy ball (like a tennis ball or a racquet ball).

* Have an assortment of other balls handy for further experimenting.

Procedure:

* Do this experiment outside

* First bounce the basketball and tennis ball side by side to compare their bounces. Start them off around chest height

* Make a hypothesis (a guess) about what will happen when you stack the small ball on top of the bigger one and then drop it

* Try it! It may take a couple tries to line them up just right but the results are pretty awesome

Explanation:

The energy of motion from the bigger ball is transferred into the smaller one. Most of your attention is on the sky-rocketing smaller ball, but if you look at the basketball, it doesn’t have much bounce at all!

Experiment further:

Hopefully this will make you think of other things. Like what if you switched the two balls and dropped the smaller one on the bottom? What if you used two of the same sized ball? A golf ball on top? Think of other things!

Activity No. 2: Penny on a Card Experiment

Materials for the Penny on the Card Experiment:

* a small plastic cup,

* a playing card

* a coin.

Procedure:

* Put a playing card on top of the plastic cup

* Put a coin on top of the card

* With a sharp flick, hit the card out from under the coin! Or pull it really quickly toward you.

* The coin will drop into the cup.

Explanation:

The coin has inertia, meaning it really wants to stay in one place. If you move the card slowly, it isn’t fast enough to overcome that force. If you flick it quickly, the coin stays in one place and then drops into the cup. An object at rest will remain at rest. If you are brave, put the card on your finger and the coin on top… try to flick...