Screws and wedges
what is a screw made up of?
a cylinder and ramp
what is the formula for input work?
input force * input distance
what is a third-class lever?
increase distance, but do not change the direction of the input force.
what are input forces?
The force you exert on a machine
what is the definition of work?
applying a force to move or change something.
what are some examples of a wedge?
zipper, ax, shovel, knife, pencil sharpener, teeth
what is the formula for output work?
output force * output distance
what is an example of a third-class lever?
Baseball bat, shovels, bones and muscles
What are output forces?
The force the machine exerts on the object
what is the definition of force?
a push or a pull
what is the formula for the mechanical advantage of a wedge?
length of wedge / width of wedge
what is the formula for mechanical advantage?
output force/input force
what is a second-class lever?
increase force, but do not change direction
what is a machine?
A machine is a device that allows you to do work in a way that is easier
what is the formula for work?
W= force x distance
what is the formula for the mechanical advantage of a screw?
length around threads / length of the screw
what is the formula for efficiency?
output work / input work X 100
what is an example of a second-class lever?
Doors, wheelbarrow, nutcracker, bottle opener
what do machines change?
the force, distance, and direction
what two things must happen to be work?
A force must applied to an object
The object must move in the same direction as the force.
what are some examples of a screw?
screws, jar lids, bolts, light bulbs
what is the formula for a wheel and axle?
radius of wheel / radius of axle
what is the formula for the Mechanical advantage of a lever?
distance from fulcrum to input force / distance from fulcrum to output force
what is a mechanical advantage?
the number of times a machine increases the force exerted on it.
what is force measured in?
Newtons