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Work, Power, Waves
| Term | Definition |
|---|---|
| wave | energy disturbance that travels through a medium |
| medium | the material the wave is passing through: solid, liquid, gas |
| transverse wave | a wave in which the particles of the medium move perpendicularly to the direction the wave is traveling |
| crest | the highest point of a wave |
| trough | the lowest point of a wave |
| longitudinal wave | a wave in which the particles of the medium vibrate parallel to the direction of a wave motion |
| compression | stress that occurs when forces act to squeeze an object |
| rarefraction | area of low relative pressure following a shock wave |
| mechanical waves | a wave that sequences a medium through which to travel |
| electromagnetic waves | a wave that consists of electric and magnetic fields that vibrate at right angles to each other |
| amplitude | the height of a wave that determines how much energy the wave carries |
| wavelength | the distance between two adjacent crests or troughs of a wave |
| frequency | the tuner of waves produced in a given amount of time |
| hertz | number of waves per second |
| wave speed | the speed at which a wave travels through a medium |
| force | a push or pull exerted on an object in order to change the motion of the object |
| work | the transfer of energy to an object by using a time that causes the object to move in the direction of the time |
| power | the rate at which work is done or energy is transferred |
| motion | the change of position of an object |
| vibration | this causes a movement that creates a wave or repeating of a motion |
| W=100J t= 10s P=? | 10 |
| W=225j P=25w t=? | 7 |
| P=20w t=15s w=? | 1.33 |
| A person weighing 600N gets on an elevator. The elevator lifts the person 6m in 10 sec. How much power was used? | 0.60 |
| How much time is needed to produce 720joules of work if 90 watts of power is used? | 8 |
| If 68w of power is produced in 18 seconds, how much work is done? | 3.77 |
| A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used? | .5714285 |
| W=500 joules t= 25 seconds p=? | 16 |
| _________ is done when an object moves through a distance because of a _______ acting upon the object | work force |
| If 150 joules of work is needed to move a box 10 meters, what force was used? | 15N w=150j d=10m |
| F=200 newtons d= 50 meters W=? | w=f*d 1200*30 10000 |
| w=125joules d=10 meters F=? | 12.5N |
| Tuning forks in water lab: What does the water do when the metal hits the water? What type of wave does it make? What medium is the wave traveling through? | vibrate electromagnetic wave water |
| Rubber band on paper or book lab: What is the source of energy causing the waves? What medium is the wave traveling through? Why is sound louder against the paper than the book? | rubber band air paper is thin |
| If 360 Joules of work are needed to move a rate a distance of 4 meters, what is the weight of the crate? | w=f*d 360 divided by f*4 90n |
| If a group of workers can apply a force of 1000 newtons to move a crate 20 meters, what amount of work will they have accomplished? | 20,000 |
| What is the SI unit for work? | joules |
| Joules is represented by what letter? | j |
| When calculating work, what is the formula? | work=force x distance |
| Rate at which work is done is called? | watts |
| formula for calculating power | P=watts divided by time |
| The SI unit for power is | watt |
| The height of a wave that determines how much energy the wave carries | amplitude |
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