Final Answer:
Gears are
toothed with
teeth on the outer edge.
They are designed to fit into the teeth of other gears, so that they
mesh or
lock together.
Gears are used to
transmit or
change the
speed or
direction of rotary motion.
An
idler gear is a
free-turning wheel that is
placed between two or more other
driving/driven wheels.
Bevel gears change the
direction through
90 degrees.
The teeth mesh at
an angle to each other.
For a hand whisk, the
rotation of the handle is
converted to the whisk by gears.
Pulleys:
A pulley is a
wheel with a
groove or
rim that goes around it.
The
groove has a
belt or
rope in it to prevent slipping.
If the amount of pulleys are increased:
mechanical advantage increases / force needed decreases.
Pulleys are used to
reduce the amount of
force needed to
lift a load or to change the
direction of the force.
Types of motion (left to right):
1.
Linear motion — e.g., sliding a book on a table
2.
Curved motion — e.g., throwing a ball in an arc
3.
Rotary motion — e.g., spinning a bicycle wheel
4.
Reciprocating motion — e.g., a piston moving back and forth in an engine
Parent Tip: Review the logic above to help your child master the concept of pulleys worksheet.
