# Pulleys

Document Sample

```					 Pulleys

Investigation 1
A Different Simple Machine
• If you needed to lift a large bale of
hay to the top of a huge stack of
hay what type of machine do you
think that you could use?
• What would it look like?
• What would its advantage be?
Single Fixed Pulley
• Single= one
• Fixed= attached & stays in place
• Pulley= Grooved wheel
Investigate:
• Can you set up a single fixed pulley
system so that it will offer an
should be able to lift the bale of hay
to the top of the stack.)
Single Movable Pulley
• Single- One grooved wheel
• Moveable- Wheel needs to move
• A moveable pulley always moves with
Investigate:
• Try to create a single moveable pulley.
It should still lift the load, BUT the
wheel needs to move.
Which system gave you a
How can we find out for sure?
• Let’s collect data by measuring it.
• Spring scale
-zero the scale,
-reading the scale (each bar is worth
2/10 or 0.2 of a Newton)
-add 0.5 N only when the effort pulls
down to account for the scale’s own
force
Collect Data:
Pulley         Load (N)   Direction   Scale     Effort (N)
(N)
Single-fixed

Single-
moveable
Reviewing Our Learning
• You can set up a pulley in 2 ways
1. Fixed Pulley
2. Moveable Pulley
• Single Fixed Pulleys change the
direction of the effort only.
• Single moveable pulleys reduce the
effort needed to lift the load.

```
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 views: 6 posted: 3/10/2012 language: pages: 8