Vocabulary
The amount by which force or motion is magnified in a simple machine
Mechanical advantage
The formula for mechanical advantage of a lever
The distance from fulcrum to effort / the distance from fulcrum to resistance
A block and tackle uses two pulleys. What is the mechanical advantage (MA)?
2
An experiment to find a better gasoline mixture for automobiles would be what type of experiment?
Applied science (useful)
Which 2 simple machines look identical?
Inclined plane
Simple wedge
What is force?
A push or pull exerted on an object in an effort to change that object's velocity
The formula for mechanical advantage of a wheel and axle
Diameter of wheel / diameter of axle
What is the MA of a wedge that has a length of slope 21 feet and a height of 3 feet?
7
A spray that when sprayed around a campsite keeps bears away is an example of ?
Technology
A 3rd class lever magnifies what?
Speed
What is circumference (including the formula)?
The distance around a circle, 3.1416 times the circle's diameter
The formula for mechanical advantage of a pulley
The number of pulleys used
What is the MA of a wheel and axle if the diameter of the wheel is 6 inches and the diameter of the axle is 3 inches?
2
A lever in which the effort is in the middle.
What is a 3rd-class lever?
What are the 6 types of simple machines?
lever, wheel and axle, pulley, inclined plane, wedge, screw
What is diameter?
The length of a straight line that travels from one side of a circle to another and passes through the center of a circle.
The formula for mechanical advantage of a screw
Circumference / pitch
What is the MA of a screw if the circumference is 40 inches and the pitch is 5 inches?
8
Technology is often a result of what 3 things?
Science, applied science, or accident
Does a single or double wedge have more MA and why?
Single because a double wedge has twice the height (the more height, the smaller the MA)
Effort is exerted along the ________ of an inclined plane but against the _______________ of a wedge.
slope
short side
The formula for mechanical advantage of a wedge
The length of slope / total height
What is the MA of a screw that has a diameter of 30cm and a pitch of 2cm?
47.1
A pencil sharpener is made up of what 2 simple machines?
Wheel and axle
ScrewExplain the difference in MA for a wheel and axle
Turning the wheel magnifies force
Turning the axle magnifies speed