Upload
miles-lucas
View
228
Download
0
Embed Size (px)
Citation preview
• First, rank the following words from 0-5 (0= you have never heard of this word & 5= you know the word VERY well). Second, explain what the following terms mean in your own words:a. Machine g. Pulley
b. Simple machines h. Wheel & Axle
c. Work i. Inclined Plane
d. Force j. Wedge
e. Work input/Work output k. Screw
f. Lever l. Compound Machine
YOURS: TEXTBOOK:
• A machine is a device that makes work easier by changing the size or direction of a force.
• Examples: wheelchair, scissors, chopsticks
YOURS: TEXTBOOK:
• Work is the transfer of energy to an object by using a force that causes the object to move in the direction of the force.
• Work is done on an object if two things happen: 1) the object moves as a force is applied, 2) the direction of the object’s motion is the same as the direction of the force.
• Examples: pushing a ball up a hill
YOURS: TEXTBOOK:• A push or a pull
exerted on an object in order to change the motion of the object; force has size and direction.
• Examples: people, bulldozer, static electricity
YOURS: TEXTBOOK:
• Work input is the work done on the machine.
• Work out put is the work done by the machine.
• Examples: opening a paint can
YOURS: TEXTBOOK:
• A machine or simple device without moving parts.
• Examples: lever, pulley, wheel & axle, inclined plane, wedge, screw
YOURS: TEXTBOOK:• A lever is a simple
machine that has a bar that pivots at a fixed point, called a fulcrum.
• Examples: first-class lever (see saw), second-class lever (wheelbarrow or soda bottle opener), third-class lever (lifting weights or hammering a nail)
YOURS: TEXTBOOK:
• A simple machine that has a grooved wheel that holds a rope or a cable.
• Examples: fixed, moveable, block and tackle
YOURS: TEXTBOOK:
• A simple machine consisting of two circular objects of different sizes.
• Examples: car’s wheel & axle, faucet
YOURS: TEXTBOOK:
• A simple machine that is made up of two inclined planes that move; often used for cutting.
• Examples: knife, axe, door stop
YOURS: TEXTBOOK:
• A simple machine that consists of an inclined plane wrapped around a cylinder.
• Examples: screw, light bulb
Activities• Museum of Science & Industry
• Lemelson Center’s Invention at Play