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JohannahsStudy Stack
Energy
| Question | Answer |
|---|---|
| Define force | Is a push or pull exerted on an object in order to change the motion. Force=newtons |
| Define and give an example to describe work | The use of force to move an object some distance EXAMPLE: A person pushing a box |
| What is this? High bands of water or sound. | Wave |
| The top of a wave is called? | Crest |
| What is a trough? | The bottom of the waves |
| Define and know what a longitudinal wave looks like. | Energy is transferred from one end of the spring toy to the other going back and fourth. A longitudinal wave is straight and has compressions and rarefactions. |
| Know where the Compressions are,what wave they are in, and be able to define what it is. | The compressions are when the waves are really close together and they are in a longitudinal wave, and they are where the particles are the closest together. |
| Know where rarefactions are, what wave they are in, and be able to define what they are. | A rarefaction is where the waves are further spread apart and they are in a longitudinal wave, When the particles are more spread out. |
| Define and know what a Transverse wave looks like. | When particles move perpendicularly to the direction the wave travels. It looks like waves going up and down. |
| Waves that require a medium... Give examples of what that require a medium. | Mechanical waves. music waves,water waves, a towel waving in display. |
| Define Electromagnetic waves and give examples. | They are vibrations of electric and magnetic fields, do not require a medium. visible light, radio waves, microwaves,x-rays, UV light |
| Define amplitude. | A measure of how far particles in the medium move from their rest position. |
| The distance from any point on a wave to the next identical point... | Wavelength |
| Define frequency | The number of waves that pass a point in a given amount of time, usually one second. |
| Frequency is measured in...? | Hertz, one hertz is is equal to one wavelength per second. |
| Define wave speed | The speed that waves travel. This depends on the properties of a medium. |
| The ability to use force to move an object....? | Power |
| Formula for Work? | W=FxD W=PxT |
| calculate work.... The runner moved a distance of 5 miles and he had a 25 pound box he had to carry. | W=FxD W=25x5 W=125j |
| Formula for power? | P=work divided by time |
| Solve for power. If a man moves a large box that weighs 20Newtons 15 meters in 45 seconds how much power was used? | step 1: W=FxD Step 2: P=work divided by time W=20x15 P= 300/45 W=300j ( P=6.7watts) <--- answer |
| How much time is needed to produce 800 Joules of work if 60 watts of power is used? | T=work divided by power T= 800/60 (T= 13.3 seconds)<---Answer |
| calculate wave length... 7m= 14m/s Divided by F | F=2 Hertz |
| For a wave to be longitudinal it has to have______ and _______ | compressions and rarefactions |
| A wave with a lot of waves is high or low amplitude | high amplitude |
| A wave with low heights is a high or low amplitude? | Low amplitude |
| We measure the wave length of a transverse wave from ____ to ____ or ______ to ____ | crest to crest or trough to trough |
| We measure wave length in a longitudinal wave from _____ to ____ or ______ to _____ | compression to compression or rarefaction to rarefaction |
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