Wheels & Rollers
A round object that can move loads but is NOT attached to the object/load
Roller
What is a pulley made of?
Wheel and rope
A pencil sharpener or pasta roller is an example of this system
Wheel to wheel
The object being moved
Load
When two objects rub together
Friction
What famous structure was built using rollers?
Pyramids
True or False: A single pulley requires less force than a block and tackle (double pulley)
False
This system is commonly found at grocery store checkouts
A belt system
Scissors are in which class of lever?
Class 1
The unit used to measure force.
Newton
A circular device that IS attached to an object/load.
Wheel
What is the name of a double pulley
Block and tackle
A wheel with teeth that can be found on bikes, watches or clocks.
Gear
The point on which a lever rests and pivots.
Fulcrum
A wheel with teeth that interlock
Gear
Can wheels or rollers roll continuously?
Wheels
What is the main purpose of a pulley
Change the direction of the force
A bicycle uses this type of drive system
A chain system
I am a fixed lever that helps move an object up a slope.
Inclined plane
the amount of help you can get by using a simple machine.
Mechanical Advantage
What can wheels do that rollers cannot?
Turn, because of the axle.
What is the advantage of using a double pulley?
Half the effort needed
90 degree gears can be found where?
A Car
What happens if the fulcrum is moved closer to the load?
Less effort is needed
Scientists use it to test and learn new information.
The Scientific Method