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Coin’s Gravity

By Nancy 6A

+Problem / Question

Will the heaviest coin touch the bottom of the drinking bottle faster?

+Observation / Research

Gravity the force that attracts a body toward the center of the earth, or toward any other physical body having mass.

+Hypothesis

I think that the heaviest coin will need less time to touch the bottom of the bottle because it will drift through water faster.

+Independent Variable

Kind of coin I’m going to use Dubai coin, Rp. 1,000 coin, Rp.500 coin

and Rp. 200 coin.

+Dependent Variable

In this case, it will be the time the different kinds of coins will touch the bottom of the bottle faster.

+Control Variable

The kind of bottle

The amount of water

The height from where the coin will be dropped from

+

Experiment

Materials Equipment

800 ml of water 4 different kinds of coin (Dubai coin, Rp. 1,000 coin, Rp.500 coin and Rp. 200 coin)

1 drinking bottle with wide opening

1 measuring cup

1 stopwatch

1 m ruler

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Measure 800 ml of water using the measuring cup and pour it inside the water bottle after removing the cover.

Steps / Procedure (1st)

+Steps / Procedure (2nd)

Place the 1 m ruler behind the bottle.

+Steps / Procedure (3rd)

Drop the different kinds of coins from 70 cm and count the time using the stopwatch.

+Steps / Procedure (4th)

Record the data.

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Kinds of Coins Trials (Time needed) Average

1st 2nd 3rd 4th

Dubai coin 0.95 sec

0.53 sec

1.35 sec

0.59 sec

0. 855 sec

Rp. 1,000 coin 0.56 sec

0.60 sec

0.61 sec

1.38 sec

0. 7875 sec

Rp.500 coin 0.65 sec

0.98 sec

0.91 sec

0.91 sec

0. 8625 sec

Rp. 200 coin. 1.20 sec

1.40 sec

0.98 sec

1.53 sec

1. 2775 sec

+Conclusion

So, my hypothesis is not proven because all the coins weigh the same but the Rp. 1,000 coin needs least time to drift through water faster (in average). Next time, if we do this experiment again, we can modify it by changing the dependent variable which is the different kinds of coins into different amount of water or the height we will drop the coin from.