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Mechanical Systems 1
Quiz topics 1-3
| Question | Answer |
|---|---|
| What is a machine | device that helps humans do work |
| Archimedes screw | moves water from low to high areas |
| simple machines | tool made up of one basic machine with one function |
| inclined plane | make it easier to move heavy objects |
| levers | rotate about a fulcrum |
| wedge | splits something apart |
| screw | cylinder with grooves cut in a spiral |
| pulley | rope moving in a grooved wheel |
| wheel and axle | A larger wheel attached to a smaller cylinder. Creates rotational movement |
| work formula | force x distance |
| work definition | measure of energy transfer that turns force into movement |
| unit for work | joules |
| unit for force | newton |
| unit for distance | meter |
| load | mass you are moving |
| effort | force you exert |
| fulcrum | supports a lever |
| class one lever | fulcrum in the center of lever |
| class two lever | load in the center of lever |
| class three lever | effort in the center of lever |
| way to remember lever class | 3, 2, 1 ELF |
| mechanical advantage | amount that a machine can multiply a force |
| input force | force applied to a machine |
| output force | force done by machine on the load |
| mechanical advantage calculation | output force/input force |
| mechanical advantage greater than 1 | gained a force advantage |
| mechanical advantage less than 1 | gained a speed advantage |
| mechanical advantage equal to 1 | machine is changing the direction of the effort force |
| gear | rotating wheel with teeth around the rim |
| gear train | 2 or more gears together |
| driving gear | driver. This one moves first |
| Driven gear | follower. These move after the first |
| gear speed ratio | number of driver gear teeth/number of follower gear teeth |
| fixed pulley | attached the pulley to something that does not move |
| moveable pulley | the pulley itself moves |
| combination pulley | block and tackle. Mixture of moveable and fixed pulleys |
| potential energy | stored energy ready to do work |
| kinetic energy | energy an object has because of motion |
| what slows everything down? | friction |
| friction definition | a force applied in the opposite direction as the input force |
| efficiency | measurement in percent of how well a machine uses energy. |
| efficiency formula | output work/input work x 100 |
Created by:
carly.riddle
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