Simple
Machines
Gears
& Pulleys
Goals:
To
introduce gears, how they work, and when to use them
To introduce pulley systems, how they work, and when to use them
Real
World Applications:
Gears- Cars, clocks, cameras, CD-ROM Drives
Pulleys- Cranes, flag pole, elevator, zip lines
Read
the following few pages on Gears and Pulleys
to learn how they work.
Use the appropriate yellow kits (found in the back gray cabinet - ask for assistance in getting these) to build the following models:
1.
Click here to for directions on
building an amusement park
ride.
Follow the directions for
building both 5A and 5B. Note the
difference between what happens when you turn the handles on the two models.
2.
Three different gearboxes are going around the room: red, blue, and
yellow. Figure out the gear ratios
of each box.
3.
You have a motor that goes 18 mi/hr and is unable to pull much of a load.
You need your motor to go 10 mi/hr to increase the amount of force it can
handle. Draw a gearbox that would
enable you to do so.
6.
Build the crane shown in the picture by following the instructions.
You will need to
build a hook in place of the one shown in the instructions, because this part is
not available.
7.
At step 4A use our extra pieces to determine how much weight your crane
can lift.
8.
Change your model so it has a moveable pulley as shown in step 4B.
Determine how much weight your crane can now lift.
Which crane is more effective?
