WHEEL AND AXLE:
WHEEL AND AXLE : A wheel and axle is a modification of a pulley. A wheel
is fixed to a shaft. The wheel and shaft must move together to be a simple
machine. Sometimes the wheel has a crank or handle on it. Examples of wheel
and axles include roller skates and doorknobs.
ACTIVITY:
How does the simple machine called the wheel and axle make work easier?
MATERIALS:
empty spool of thread
string
paper cup
20 pennies
2 pencils
tape
1. Push pointed end of pencils into each end of the thread spools (make
sure they are
secure)
2. Suspend the pencils from the edge of a table with two loops of string--make
sure
they are level. Tape the string to the table.
3. Punch holes at the top of each paper cup. Attach a 60 cm string to each
cup. Mark
the cups A and B.
4. Tape the string attached to cup A to the pencil and wind all of the string
onto the
pencil by turning the pencil away from you.
5. Tape the string attached to cup B to the thread spool . Turn the pencils
toward you
to wind up all of the string onto the spool.
6. Place 10 pennies in cup A.
7. Cup B should be at its top position. Add pennies to cup B one at a time
until it
starts to move slowly.
8. Observe the distance both cups moved.
To WORK
IS SIMPLE WITH SIMPLE MACHINES