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SCIPAD - BIG IDEAS - BOOK 2
FORCES AND MOTION
Investigating Levers
Aim:		 To investigate the advantage of using a lever to lift a load.
Equipment: 30 cm ruler, a pencil, 2 plastic cups, 20 marbles, tape.
Method: 1. Tape the two cups to either end of the ruler centred 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 (0) end 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.
6. Move the pencil to the 13 cm mark and repeat steps 4 and 5.
7. Move the pencil to the 10 cm mark and repeat steps 4 and 5.
Results:
Experiment Side length Marbles in Cup 1 Marbles in Cup 2
1 1:1
2 1:2
3 1:3
Conclusion: Write a conclusion related to the effort required to balance a load as the pivot gets
closer to the load.
		





1. Place one marble in cup 2. Find the distance the pencil needs to be placed away from
cup 1 to balance the cups. 
2. Use the key words to complete the paragraph.
short - effort - loads - fulcrum - long - reduce - greater
Levers can be used to 			 the effort needed to lift  .
A 			 lever needs less effort to lift a load than a  lever.
When the 			 is placed very close to the load a small  is
needed to lift the load. However, the end of the lever where the effort is applied will need
to move through a 				 distance.
Cup 1 Cup 2
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