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Chaper 8 Terms CMpd1
| Question | Answer |
|---|---|
| • Work | occurs when a force causes an object to move in the direction of the force |
| • Work is ONLY done when | a force makes that object move |
| • These 2 things must be present in order for work to be occurring | Force and Motion |
| • What is the work formula ? | W=F x d |
| • Power – include picture(s) | the rate at which work is done |
| • What is the power formula? | P=W/t |
| • Watt - include picture(s) | the unit used to express power |
| • Machine - include picture(s) | A device that helps make work easier |
| • Work Input | The work you do on a machine |
| • Work Output | The work done by a machine |
| • When can work output be GREATER than work input? | Never |
| (carefully read last paragraph p. 193) | |
| • “Machines don’t save work” . True or false? Explain your answer | True, machines just change the size or the direction of the input force |
| • Mechanical Advantage | Tells you how many times the machine multiplies force |
| • Mechanical Advantage formula | MA= output force/input force |
| • What are the 6 simple machines? | Lever, Pulley, Wedge, Screw, Inclined Plane, Wheel and Axel |
| • Examples of - include picture(s) | Lever=Hammer, Pulley= Crane, Wedge= Knife, Screw= Woodscrew, Inclined Plane= Ramp, Wheel and Axel= Doorknob |
| • Fulcrum | The single pivot point on a lever |
| • Examples of each of the 3 classes of levers - include picture(s) | 1st Class= A hammer pulling up a nail, 2nd Class= A wheel barrel 3rd Class= A hammer driving a nail into a board |
| • Inclined Plane | a simple machine that is a straight slanted surface |
| • How do you increase the mechanical advantage of an inclined plane? | Make the plane longer than comparison with the height. |
| • Examples of Inclined Planes -- include picture(s) | pushing a piano up a ramp into a truck, using a ramp to get a couch down instead of stairs. |
| • Wedge | A double inclined plane that moves. |
| • Examples of Wedges - - include picture(s) | Knife, Chisel |
| • Screws | The screw is really an inclined plane wrapped around an axel |
| • Examples Screws -- include picture(s) | Bolt, Woodscrew |
| • How do you change the mechanical advantage of a screw? | tighten the threads of the screw |
| • Wheel & Axle | A machine consisting of two circular objects of different sizes |
| • Examples of Wheel & Axle -- include picture(s) | Doorknob, Steering wheel |
| • Pulley | Consisting of a grooved wheel that holds a rope or cable |
| • Examples of Pulleys -- include picture(s) | Crane and its cable |
Created by:
PhySciLewis1
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