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Energy
waves, work, and power
Question | Answer |
---|---|
What's the force unit of measurement | A push or pull extended from an object in order to change the order of the object, measured in newtons |
Work | The force used to measure the distance by joules |
Wave | Vibrations inside a medium |
Crest | The point where the wave is highest |
Trough | The point where the wave is lowest |
Congitudinal Waves | When the waves move back in fourth in a coil |
Cmpression | When the coil is compacted |
Rarefration | When the spring coils spread apart |
Transverse Waves | Spring coil waves move up and down |
Mechanical waves | Waves that need a medium |
Electromagnetic Waves | Waves that travel through empty space |
Amplitude | The measure of how far particles move from their rest position in a medium |
Wavelength | The distance from any point on a wave to the next identical position |
Frequency | The number of waves that parts a point in a amount of time |
Hertz | The measure of frequency H= Wavelength per second |
Wave speed | The speed a wave travels S= D/T |
Medium | A material waves can travel through |
Power | The rate in which work is done P= W/T |
Work | Force x Distance |
Power | Work/Time |
Wavelength | Wave speed/ frequency |
If 360 joules of work are needed to move a crate a distance of 4 meters, what is the weight of the crates | F=W/D F= 360/4 F= 90 newtons |
If a group of workers can apply a force of 1000 newtons to move a crate 20 meters, what amount of work is accomplished | W=FxD W=1000x20 20000 joules |
if 68 joules of work is necessary to move a 4 newton crate, how far was the crate moved | 17 meters D=F/W D= 68/4 |
How much work is done holding a 15N sack of potatoes while waiting in line at the grocery store for 3 min | D=0.5 W=FxD W=15x.5 7.5 joules |
3 examples of mechanical waves | Water waves, sound waves, and music |