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Once the stones are cut, it is Harry's job to lift them onto a cart to be taken to the building site. These are massive stones and he will have difficulty lifting them.
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What tools does Harry have available?
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- There are large timbers and rocks lying around the construction site.
These are perfect parts for a lever!
- We need this lever to increase our lifting force, therefore we will
push one end of the lever under the resistance (Our stone), the fulcrum
between the ends, and we will apply a downward force at the other end.
(It is usually easier for us to apply a downward force than it is to apply a
lifting force.)
With your lab partner, predict how a lever will make lifting the block
onto the cart easier.
Record your answer in your lab packet.
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Harry will test your various adjustments to the lever.
- You will change the placement of the fulcrum and test the
effectiveness of each configuration.
- Being a true scientist you will want to collect a sufficient amount
of data. Perhaps 8 tests.
The stone has a weight of 3500 N (that's close to 800 pounds) and you need to
lift it 1 (one) meter.
- With your partner, predict fulcrum placements which will not be
successful.
- Why won't these placements be successful? Record your prediction in complete sentences in your lab packet.
- Now test your prediction (hypothesis).
- Select a placement for the fulcrum by clicking and dragging it
toward or away from the stone.
- Click on [lift]. If Harry can lift the stone, the amount of force
applied and the distance he had to exert this force will appear on
the chart.
- Move the fulcrum and try again.
- Record your data on your lab sheet.
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