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Test 7-1&8
| Question | Answer |
|---|---|
| Any material that can flow and that takes the shape of any contianer | fluid |
| All fluids exert ---. | pressure |
| What are two examples of fluids? | air & water |
| The amount of force exerted on a given area | pressure |
| The SI unit for pressure | pascal |
| Fluids exert pressure evenly in --- direction(s) | all |
| The layer of nitrogen, oxygen, and other gases | atmosphere |
| The pressure caused by the weight of the atmosphere | atmospheric pressure |
| Atmospheric pressure is exerted on --- on Earth. | everything |
| The further you go down into the atmosphere, the --- pressure there is. | more |
| When you travel to higher or lower points, what must you do? | adjust to the pressure |
| Water pressure increases as depth ---. | increases |
| Water exerts --- pressure than air. | more |
| Fluids flow from areas of --- to --- pressure. | high;low |
| The transfer of energy to an object by using a force that causes that object to move in the direction of the force | work |
| Work is a way to see the --- of energy. | transfer |
| Does applying force always result in work being done? | no |
| Why isn't work always done when force is applied? | because the object may not move at all or in the same direction. |
| Work depends on --- and ---. | distance and force |
| The unit used to express force. | joule |
| The rate at which energy is transferred | power |
| The unit used to express power | watt |
| Greater power = --- time | less |
| A device that makes work easier by changing the direction of the size and direction of a force | machine |
| The work that you do on a machine | work input |
| The work done by the machine | work output |
| Machines allow force to be applied over a --- distance. | greater |
| Machines make work easier by changing the --- or --- of the input force. | size ; direction |
| Force increases = distance | decreases |
| A number that tells how many times a machine multiplies force | mechanical advantage |
| A comparison of a machine's work output with the input | mechanical efficiency |
| The unit for mechanical advantage | none |
| Mechanical efficiency is expressed as a ---. | percentage |
| An ideal machine has --- efficiency. | 100% |
| Is it possible to have an ideal machine? | no |
| A simple machine that has a bar that pivots at a fixed point, called a fulcrum. | lever |
| Fulcrum is in between input force and load | first-class |
| Load is in between fulcrum and input force | second-class |
| Input force is in between fulcrum and load | third-class |
| A simple machine that has a grooved wheel that holds a rope or cable | pulley |
| A pulley that is attached to something that doesn't move. | fixed pulley |
| A pulley that is attached to the object being moved | movable pulley |
| When a movable and fixed pulley are combined | block & tackle pulley |
| A simple machine consisting of two circular objects of different sizes | wheel & axle |
| A simple machiene that is a straight, slanted surface | inclined plane |
| A pair of inclined planes that move | wedge |
| An inclined plane that is wrapped around a cylinder | screw |
| Machine that consists of two or more simple machines | compound machine |
Created by:
kfran0112
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