Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
What do simple machines do for us |
Makes simple tasks easier by multiplying force |
|
|
What are the simple machines |
Inclined plane, screw, fulcrum, lever, wedge, wheel and axle |
|
|
What is mechanical advantage |
Ratio of output to input force |
|
|
What is the formula for mechanical advantage |
Ma=Fo/Fi |
|
|
1st class lever |
Input-fulcrum-output; teeter tottter |
|
|
2nd class lever |
Input-output-fulcrum; wheel barrow |
|
|
3rd class lever |
Fulcrum-input-output; baseball player hitting a ball |
|
|
Chemical energy |
Energy stored in chemical bonds |
|
|
Thermal energy |
Energy from heat |
|
|
Nuclear energy |
Energy from splitting atoms |
|
|
Mechanical energy |
Energy from a machine |
|
|
Radiant energy |
Energy from light |
|
|
Sound energy |
Energy from sound waves |
|
|
Electrical energy |
Energy from electricity |
|
|
How does the length of the input arm affect the mechanical advantage of a lever |
The longer the mechanical are the higher the mechanical advantage |
|
|
what are the steps in the engineering cycle |
Design,prototype, test, evaluation |
|
|
What is efficiency and how is it expressed |
The ratio of machines output to input; percent |
|
|
Formula for efficiency |
Output/input |
|
|
How is work defined |
Force * distance |
|
|
What unit does work use |
Joules |
|
|
How is power defined |
Rate at which work is done |
|
|
What unit does power use |
Watts |
|
|
What is the difference between potential and kinetic energy |
Kinetic energy is moving and potential has the ability to move chemical energy |
