General Science Module 4 Flashcards
Blaise Pascal
forerunner of the computer
ENIACH
first electronic computer
Wilhelm Conrad Roentgen
discovered X-rays
simple machine
a device that either multiplies or redirects a force
force
a push or pull exerted on an object in an effort to change that object’s velocity
six basic kinds of simple machines
lever, wheel and axel, pulley, inclined plane, wedge, and screw
mechanical advantage
the amount by which force or motion is magnified in a simple machine
diameter
the length of a straight line that travels from one side of a circle to another and passes thougth the center of the circle.
circumference
the distance around the circle, equal to 3.1416 times the circle’s diameter
Tecnology
reults from accident, science, or applied acience.
Example of first class lever
pliers and see saw
Example of second class lever
wheelbrarrow
applied science experiements
an experiment to findbetter gasoline mixture for automobiles
example of technoolgy
a gun hunting bears
A block and tackle uses 2 pulleys. What tis the mechanical advantage?
Mechanical advantage is equal to 2
If you cann’t generate enough force to lift a rock with a first class lever the way you have to set it up, should you change the setup so that the fulcrum is closer or farther from the rock?
fulcrum should be moved closer to the rock
If a third class lever has a mechanical advantage of 5. What does that mean?
The speed at whick the resistance movees will be magnified by 5.
How is applied science different from science?
motive
What gives rise to technology?
accident, science, or applied science
What is the mechanical advantage of a first class lever in which the fulcrum is 20 inches from the resistance and 80 inches from the effort?
mechanical advantage=80/20=40
Example of third class lever
shovel
lever
consist of bar and fulcrum
wheel and axle
consist of a wheel that connects to a cylinder
pulley
consist of a wheel over which a rope or chain moves
inclined plane
is simply a ramp
screw
is composed of an inclined plne wrapped around the cyclinder of a wheel and axle.
What is the mechanical advatage of a lever in whch the effort is 10 inches from the fulcrum and the resistance is 2 inches from the fulcrum?
Mechanical advantage =10 inches/ 2 inches
Two singel wedges each have a slope that is 6 inches long and and a height of 1 inch. What is the mechanical advantage?
Mechanical advatage= 6 inches/ 1 inch=6 inches
You push a box up an inclined plane so you don’t have to lift it straight up in the air. If the inclined plane’s slope has a lenght of 10 feet and a height of 2 feet, What is the mechanical advantage?
Mechanical advatage=10 feet/ 2 feet = 5 feet
