The purpose of this task is to help you understand how forces act in a pulley system.
A single fixed pulley only changes the direction of a force - not the amplitude (the amount) of force.
In our experiment we will see how a pulley can change the direction of a force so that two weights pull against each other.
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Video: Simple machines - Pulleys
Video: Simple machines - The Wheel & Axle
Click on weights and blocks to set up experiments - you can also left-click and drag items on left-hand side of simulator.
Click and drag items to create experiments and to find out how it works - menu bar is at bottom of the simulator screen. More about levers.
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Reminder:
AN EXAMPLE EXPERIMENT: This is an experiment to help you understand the difference between a simple lever (like a 'see-saw', 'teeter-totter' or balance bar) and a simple pulley (like a hook that has no friction).
An example observation might be:
An example hypothesis might be:
An example experiment to test my hypothesis (using alternative strategies and the resources provided in the student wiki):
Fig 1. Weights set at equal distances on the balance (see-saw) and on the pulley
NEXT, consider this:
Fig 2. Weights set at unequal distances on the balance (see-saw) and on the pulley
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