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Simple Machines
• What is a machine and what does a
machine do for us?
• A machine is a device that helps us
perform tasks.
5 Main Functions of Machines
• Change Energy from one form into
another.
• For example an electric generator.
– What are the two forms of energy involved in
an electric generator?
– What are other examples of machines that
change energy from one form to another?
5 Main Functions of Machines
• Transfer forces
– A car transmission transfers from the motor to
the wheels.
– What other machines transfer forces?
5 Main Functions of Machines
• Change the direction of a force.
– Raise a flag by pulling down on a rope on a
flagpole
– What other devices change the direction of a
force?
5 Main Functions of Machines
• Change the magnitude of a force.
– A jack increases the force and allows you to
lift a car off of the ground.
– What other devices increase the force
applied?
5 Main Functions of Machines
• Change the distance or speed.
– A bicycle moves the bicycle faster than the
pedals are turned.
– What other devices increase or decrease the
speed?
Families of Machines
Lever Family
• A lever is a rigid bar that can rotate freely
around a fulcrum.
– A tetter-totter is an example of a lever.
Parts of a lever
First Class Lever
Second Class Lever
Third Class Lever
What kind of levers are these?
What kind of levers are these?
What kind of levers are these?
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