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# Work, Power, Waves

What is Force? ( Unit of measurement) A push or pull exerted on an object in order the change the motion of the object. It is measured in newtons.
What is Work? The use of force to move the object some distance. It is measured in Joules.
What is a wave? It's when particles move up and down transferring energy.
What is a medium? The solid, liquid, or gas through which a wave travels through.
What is a crest? The point where a wave is at it's highest.
What is a trough? The point where a wave is at its lowest.
What is a Longitudinal Wave? A wave which particles move back and forth the same way the wave travels.
What is a Compression? When particles are compressed or brought closer together.
What is a Rarefaction? When particles are separated or pulled apart.
What is a transverse wave? A wave which particles move perpendicularly to the direction the wave travels.
What are Mechanical waves? Waves that require a medium.
What are Electromagnetic waves? Vibrations of electromagnetic fields. They do not require a medium.
What is Amplitude? How far the particles in the medium move from their rest position.
What is Wavelength? The distance from any point on a wave to the next identical point on the same wave.
What is Frequency? The number of waves that pass a point in a given time.
What is Hertz or Hz? A unit used to measure the frequency of waves. One hertz is 1 wavelength per second.
What is wave speed? The speed that waves travel depending on the properties of the medium.
What is Power? Power is the rate (energy amount per time period) at which work is done or energy converted.
Alice has a dog that weighs 90 N and the dog travels 5 meters. How much work has been done? 450 Joules of work have been done. ( 90 times 5)
Janet is running up the stairs. Her work is 100 joules and her time is 10 seconds. How much power was used? 10 whats of power was used. ( 100 divided by 10)
What is work measured in? Work is measured in Joules.
If you put scream as loud as you can in outer space, why wouldn't someone floating next to you not be able to hear you? They wouldn't be able to hear you because there is no air in space. As it says on page 578 in the Ohio science fusion textbook " You cannot hear sound without air because you need it to transmit sound."
If you have a really big fish bowl and your friend is on the other side of it, would you be able to hear them better if there was water in it or not? Why? You would be able to hear them better if there was water in it because in water the particles are touching. So the sound wouldn't have to travel as far from particle to particle.
If 68 W of power is produced in 18 seconds, how much work is done? 1224 Joules of work is done.
If 360 joules are used to move a box 4 meters, what is the weight of the box? The box weighs 90 Newtons.
If you used 68 Joules of energy to move a 4 newton person, how far was the person moved? 17 Meters were used to move the person.
Created by: 323584