WORK AND ENERGY. CHAPTER 9. 9.1 WORK, POWER, AND MACHINES. This is an ad which used a Rube Goldberg type application….many simple machines working together to accomplish a simple task: http://www.daboyz.org/honda/
TRYING TO LIFT THE OBJECT BUT IT DOES NOT MOVE….IS WORK BEING DONE?
If you lift one ______ from your waist to over the top of of your head you have done one JOULE of work.
Running up the steps and walking take the same amount of work….but which requires more power?
If you quickly move an object weighing one newton from your waist to over your head in one ______ you have done one WATT of work.
WORK INPUT ALWAYS EQUALS WORK OUTPUT.
Machines with a MA of more than one multiply force and those with a MA of less than one increase the distance and speed.
Make a chart in your notebook similar to this one and label it SIMPLE MACHINES. Place the name of each simple machine at the top of a column and then draw a picture of each under its name. Then identify several example of each type of simple machine.
A SINGLE FIXED PULLEY has a MA of ____.
A SINGLE MOVABLE PULLEY has a MA of ___.
MULTIPLE PULLEYS can have various MA’s.
A long gradual slope has a larger MA than a short steep slope.
Creation of the Sun, Moon, and Plants
Depends on mass and speed but more on speed.
MECHANICAL it SIMPLE MACHINES. Place the name of each simple machine at the top of a column and then draw a picture of each under its name. Then identify several example of each type of simple machine.
HEATEXAMPLES OF POTENTIAL AND KINETIC ENERGY
A ____ at the top of a hill has potential energy.
A _____rising to the top of a hill has kinetic energy.
When potential and kinetic energy transformations are taking place some energy is lost as HEAT energy or SOUND energy.
Energy cannot be ______ or _______.
God created the universe with energy.
Not all of the work done by a machine is useful work.
No machine is 100% efficient.
Perpetual motion machines are impossible.