Human Needs for Machines
the definition of a machine
what is a device that has several parts, each with a function that performs a task
The six simple machines
What is lever, screw, wedge, incline plane, wheel/axle and pulley
A group of parts working together to perform a task
What is a system
A pair of wheels with interlocking teeth
What is a Gear
A cap and bottle is this type of simple machine
What is a screw
The Persian wheel used what type of energy source
What is animal power
The location of a the fulcrum, load, and force in a third class lever
What is the force is between the fulcrum and the load (example:stapler)
Individual simple machines within a system
What is a sub-system
The gear that starts the work being done
What is drive gear
What is a wheel and axle
The invention that followed the Persian wheel, and was powered by humans
What is Archimedes screw
The wedge is made of what other simple machine
What is two inclined planes back to back
Scissors are an example of a complex machine, what simple machines make it up?
What is lever and wedge
The gear that performs the work
What is driven gear
The definition of a lever
What is a bar resting on a fixed point
The two sources of energy for todays machines
What is electricity and fuel
This simple machine can be used to lift an object. Using two or more of these can decrease the effort required to lift an object
What is pulleys
The component that transfers energy within a complex machine
What is linkage
When a small gear drives a big gear
What is reduction
When two gears are of the same size
What is parallel gears
The Romans created this to transport water for large cities
What is aqueducts
The four effects (purposes) of simple machines
What is changing the direction of force, multiplying the force, increasing or decreasing speed and transferring force
A system used to transfer much larger forces
(similar to gears on a bicycle)
What is a transmissions
When a big gear drives a small gear
What is multiplying gears
In simple machines you gain force but you lose
What is distance