Gr8_Fluids_unit2_ch9
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Created by:
NLscience7-9 on September 29, 2011
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13 terms
Terms | Definitions |
|---|---|
 Force | anything that causes a change in the motion of an object (can be a push or a pull) |
| Newton (N) | the standard SI unit for measuring force |
| Balanced forces | these forces are equal in strength and opposite to each other in direction (in this situation the objects will not move) |
| Unbalanced forces | these unequal forces cause a change in the speed or direction of an object (in this situation an object will move) |
| Mass | the amount of matter in an object ( the standard unit of its measurement is in kilograms (kg)) |
| Weight | a measure of the force (pull) of gravity on an object (the standard unit of its measurement is in Newtons (N)) |
| Buoyancy | the upward force on objects submerged in or floating on fluids |
| Average density | the total mass of all substances that make up the object divided by the total volume |
| Pressure | the force acting on a certain area of a surface |
| Pascal's law | pressure applied to an enclosed fluid is transmitted with equal force throughout the entire container |
| Hydraulics | the study of pressure in liquids |
| Hydraulic systems | devices that transmit applied force through a liquid to move something else |
| Pneumatic systems | devises that use a gas to transmit a force |
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