Equipment: 30 cm, a pencil, 20 marbles, blue tak.
Method:
1. Tape the two cups to either end of the ruler centered on the 2 cm and 28 cm mark.
2. Place the pencil under the ruler at the 15 cm mark. The pencil will act as the pivot point.
3. Add 10 marbles to the cup at the zero ends of the ruler.
4. Add marbles one by one to the other cup ( at the 30 cm end ) until the cups are balanced.
5. Record how many marbles were needed.
Results:
Experiments
|
Side length
|
Marbles in cup 1
|
Marbles in cup 2
|
1
|
1:1
|
10
|
10
|
2
|
1:2
|
10
|
7
|
3
|
1:3
|
10
|
3.5
|
Conclusion:
You need less marble as it gets closer to the fulcrum to make them even.
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