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Work, power, waves
| Question | Answer |
|---|---|
| Wave | A type of energy transfer. |
| Medium | A material either solid, liquid, or gas that a wave can travel through. |
| Transverse wave | The particles move perpendicularly to the direction the wave travels. |
| Crest | The highest point in the wave. |
| Trough | The lowest point in the wave. |
| Longitudinal wave | The particles move back and fourth in the same direction the wave travels. |
| Compression | When a longitudinal wave is pushed forward. |
| Rarefaction | When a longitudinal wave is pulled back. |
| Mechanical waves | Waves that require a medium. |
| Electromagnetic waves | Vibrations of electric and magnetic waves. |
| Amplitude | The measure of how far particles in their medium move from their rest position. |
| Wavelength | The distance from any point on the wave to the to the next identical point on the same wave. |
| Frequency | The number of waves that pass through a point in a given amount of time. |
| Hertz | The unit frequency is measured in. |
| wave speed | The speed that waves travel. |
| Force | A push or a pull exerted on an object to change the motion of an object. |
| Work | Work= f*d |
| Power | Power= w/t |
| If John moves a box 50m using 100N of force what amount of work did he accomplish? | 5,000j |
| If Jacob accomplished 200j of work lifting boxes for 40s how much power did he use? | 5 watts |
| Why does it take the same same amount of work to climb up stairs quickly as it does slowly? | To get work you do distance times force. The distance and force don't change climbing stairs quickly or slowly. That's why the amount of work doesn't change climbing the stairs quickly or slowly. |
| Is work done on an object when you pick it up and hold it while standing still? | No, because it isn't being moved any distance. |
| What is a measure of the rate that work is done. | Power |
| List three types of electromagnetic waves. | Radio, visible light, microwave, x-ray |
| How does the medium that a wave travels through effect its speed. | Waves travel faster in medium that have stronger interaction between particles. So, they usually travel faster in solids, then liquids, and slowest in gases. |
| Which radio station uses higher energy waves, 97.9 or 104.9 | 104.9, uses higher energy waves because higher frequency electromagnetic waves have more energy. |
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