Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Chaptes 7, 8, & 9
Study Guide
| Question | Answer |
|---|---|
| Fluid | Any fluid that flows and takes the shape of its container. |
| Pressure | Force exerted on a goven area. |
| Atmospheric Pressure | The pressure caused by the weight of the atmosphere. |
| Fluid pressure _________ as depth ___________. | increases, increases |
| Fluids flow from areas of ____________ to areas of ________________. | High Pressure, low pressure |
| Buoyant Force | All fluids exert an upward force. |
| Archimedes' Principle | States that the buoyant force of an object is equal to the weight of the fluids displaced by the object. |
| Bernoulli's Principle | States that fluid pressure decreases as the speed of teh fluid increases. |
| Pascals Principle | States that a change in pressure in an enclosed fluid is transmitted equally to all parts of the fluid. |
| Density = | mass/volume |
| Pressure = | force/area |
| Any object tha is more dense than the surrounding area will _______. | sink |
| An object that is less sense than the surrounding area will ______. | float |
| The overall density of an object can be changed by changing the objects what? | shape, mass, or volume |
| When is work done? | When a force causes an object to move in the direction of the force. |
| Work = | force x distance (W = f x d) |
| The unit of work is what? | newton-meter or joule |
| How is power measured? | by how fast work is done |
| Power = | work divided by time (P = w/t) |
| The unit of power is what? | joule per second or watt |
| Mechanical Advantage (MA) | tells how many times a machine multiplies force. |
| How does a machine make wor easier? | By changing the size or direction (or both) of a force. |
| A machine can _________ force or direction, but not _____. | increase, both |
| Machenical Advantage | Tells how many times a machine multiplies force. |
| Mechanical Efficiency | A comparison of a machine's work output with work input |
| Whay are machines not 100% effcient? | because some of the work done is used to overcome friction. |
| Compound Machines | They have low mechanical efficiencies because they have more moving parts and therefore more friction to overcome. |
| Energy | The ability to d work |
| Energy and work are expressed in what units? | joules (J) |
| Kinetic Energy | Energy of motion (depends on speed and mass) |
| Kinetic Energy = | mv /2 |
| Potential Energy | Energy of position |
| Gravitational Potential Energy = | weight x height |
| Mechanical Energy | the sum of kinetic energy and potential energy |
| What other forms of energy can be considered kinetic energy? | thermal energy and sound energy |
| What other forms of energy can be considered potential energy? | chemical energy, electrical energy, and nuclear energy |
| Energy Conversion | Change from one form of energy to another |
| Can any form of energy be converted to another form of energy? | yes |
| Your body uses food to change what type of energy into what other type of energy? | chemical energy into kinetic energy |
| Plants convert what energy into what energy | light energy into chemical energy |
| During an energy conversion some energy is converted into thermal energy. Why? | because of friction |
| Law of Conservation of Energy | Energy cannot be created nor destroyed. |
| What is used in most US power plants? | coal |
| Mechanical Energy = | potential energy + kinetic energy |
| What are the forms of energy? | thermal, chamical, electrical, sound, light, and nuclear. |
| What are fossil fuels? | Nonrenewable energy resouce formed from the remains of organisms that lived long ago. |
| Name two fossil fuels. | oil and coal |
Created by:
teriksen
Popular Physical Science sets