| Question |
 |
|
| Answer |
|
|
| What is Work? |
is when a force causes and object to move in the direction of the force. |
| What is joule? |
Joule is the unit used to express work. |
| What is a watt? |
The unit used to express power. |
| What is power? |
Power is the rate at which work is done. |
| Define Machine |
A machine is a device that helps make work easier by changing the size or direction of a force. |
| Work input |
the work you do on a machine. |
| Work output |
the work done by the machine |
| lever |
a simple machine consisting of a bar that pivots on a fixed point ( fulcrum ). |
| inclined plane |
a simple machine that is a straight slated surface. |
| wedge |
is a double sided inclined plane that moves |
| pulley |
is a simple machine consisting of a grooved wheel that holds a rope or a cable |
| compound machine |
made of two or more simple machines |
| mechanical efficiency |
is a comparison of a machine's work output with the work input |
| mechanical advantage |
tells you how many times the machine multiplies force |
Ch.18 LTI-MA 509
