| definition or example |
name |
| device that changes the direction and/or magnitude of a force |
simple machine |
| rigid object used with a fulcrum to increase mechanical force being applied to another object |
lever |
| What class lever has the fulcrum located between the input effort and the output load? |
First-class lever |
| What class lever are these examples: seesaw, crowbar, pliers, scissors? |
First-class lever |
| What class lever follows this design?-input effort applied at the end of a bar-fulcrum located at opposite end of a bar-output load is at point between input and fulcrum |
Second-class lever |
| What class lever are these examples? nutcracker, wheelbarrow, bottle opener, wrench |
Second-class lever |
| What class lever follows this design?-input effort is higher than output load-input effort is applied between output load on one end and the fulcrum on the opposite end |
Third-class lever |
| What class lever are these examples?mousetrap, nail clippers, stapler, hammer |
Third-class lever |
| an inclided plane wrapped around a shaft |
screw |
| blender, automatic garage doors, drill bit |
screw |
| a lever that turns a central rod or fulcrum |
wheel and axel |
| bicycle tire, ferris wheel, gears |
wheel and axel |
|
l |
| point where force is applied is called effort, effect of force is called "load" |
lever |
| flat surface whose endpoints are at different heights |
incline plane |
| ramp, sliding board, knife blades |
incline plane |
| also known as "block and tackle"rope, cable, belt, or chain placed inside a wheel's track and around its circumference |
pulley |
| blinds, shoe laces, flagpole, water well |
pulley |
| triangular shaped tool with 2 or more sloping surfaces that taper to a thin edge; the narrower the angle the less force is required |
wedge |
| chisel, axe, fork tines, door stops |
wedge |
| any combination of simple machines that work together |
complex machines |
| airplane, automobile, telephone, vacuum cleaner, sewing machine |
complex machines |
Science Vocab 147928
