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# Waves,Work,Power

What direction do waves travel? Outward in all directions from the disturbance.
Waves carry both energy and matter. True or False? False- Waves only carry energy through a medium.
What type of wave does not need a medium to carry energy from one place to another? electromagnetic waves can travel through empty space
If a firework went off in outer space, what would it sound like? Nothing. Sound is a mechanical wave that needs a medium to travel through and in space there is no atmosphere for the sound waves to travel through.
A high pitched sound would have a __________________ frequency. high
A loud sound would have a high _____________________. amplitude
Light traveling from the sun to Earth is an example of a(n) ___________ wave. electromagnetic- it travels through empty space to get here (not requiring a medium)
How would you describe the wavelength of a very low pitched sound? A low pitched sound would have longer wavelengths because the frequency is low.
What is frequency? Frequency is how often waves pass a point in a given amount of time. It is measured in Hertz (waves per second).
What is amplitude? Amplitude is a measure of how much energy is carried in a wave. The further the distance from the crest/trough to the resting point the greater the amplitude.
What type of waves have crests/troughs? transverse waves
What type of waves have compressions and rarefactions? longitudinal waves
Sound waves compress and stretch the medium they travel through. This must mean sound waves are considered ______ waves. longitudinal
The epicenter of an earthquake is where the disturbance in the earth occurs. What direction do the waves of energy travel from the epicenter? outward in all directions.
What is the mathematical formula to calculate work? work = force x distance
What is the mathematical formula to calculate power? power = work / timer or power = (force x distance )/time
What unit is force measured in when calculating work? Newtons
What unit is distance measured in when calculating work? meters
What unit is work measured in? Joules or Newton-meters
What unit is time measured in when calculating power? seconds
What unit is used to measure power? Watts or Joules/sec
If Jessica used 150 Newtons to carry her bookbag and she 800 meters home, how much work did she do on the bookbag? w = f x d w = 150 x 800 w = 120,000 joules
If Parker weighs 80 kg, what is the force he uses to move? 9.81 m/s2 is the force of gravity. 80 kg x 9.81 = 784.8 Newtons
If Parker is 784.8 Newtons and he runs 400 meters on the track in 1 minute and 22 seconds, how much work does he do? w = f x d w = 784.8 x 400 w = 313,920 joules
If Parker is 784.4 Newtons and he runs 400 meters on the track in 1 minute and 22 seconds, how much power does he use? time needs to be in seconds.... 1 minute = 60 seconds + 22 seconds = 82 seconds w = 313,920 joules P= w / t P= 313,920 /82 P = 3,828.3 Watts
Julie and Josh are both 392 Newtons. They both ran around the track two times (800 meters). Julie finished her two laps in 3 minutes and 2 seconds, while Josh took 4 minutes to finish his laps. Who did more work? They both completed the same amount of work. Time does not affect work. w = f x d, they both require the same amount of force to move around the track and they both traveled the same distance, so they both completed 313,600 joules of work.
Dominic tried as hard as he could to lift the 225 kg barbell, but it wouldn't budge. How much work did he do? None, the barbell did not move. w = f x d d= 0 and anything times 0 gives you 0.
Created by: Mrs.Koch