# Energy

Define force

Is a push or pull exerted on an object in order to change the motion.

Force=newtons

Define and give an example to describe work

The use of force to move an object some distance

EXAMPLE: A person pushing a box

What is this?
High bands of water or sound.
Wave
The top of a wave is called? Crest
What is a trough? The bottom of the waves
Define and know what a longitudinal wave looks like. Energy is transferred from one end of the spring toy to the other going back and fourth.
A longitudinal wave is straight and has compressions and rarefactions.
Know where the Compressions are,what wave they are in, and be able to define what it is. The compressions are when the waves are really close together and they are in a longitudinal wave, and they are where the particles are the closest together.
Know where rarefactions are, what wave they are in, and be able to define what they are. A rarefaction is where the waves are further spread apart and they are in a longitudinal wave, When the particles are more spread out.
Define and know what a Transverse wave looks like. When particles move perpendicularly to the direction the wave travels. It looks like waves going up and down.
Waves that require a medium…
Give examples of what that require a medium.
Mechanical waves.
music waves,water waves, a towel waving in display.
Define Electromagnetic waves and give examples. They are vibrations of electric and magnetic fields, do not require a medium.
visible light, radio waves, microwaves,x-rays, UV light
Define amplitude. A measure of how far particles in the medium move from their rest position.
The distance from any point on a wave to the next identical point… Wavelength
Define frequency The number of waves that pass a point in a given amount of time, usually one second.
Frequency is measured in…? Hertz, one hertz is is equal to one wavelength per second.
Define wave speed The speed that waves travel. This depends on the properties of a medium.
The ability to use force to move an object….? Power
Formula for Work? W=FxD
W=PxT
calculate work….
The runner moved a distance of 5 miles and he had a 25 pound box he had to carry.
W=FxD
W=25×5
W=125j
Formula for power? P=work divided by time
Solve for power.
If a man moves a large box that weighs 20Newtons 15 meters in 45 seconds how much power was used?
step 1: W=FxD Step 2: P=work divided by time
W=20×15 P= 300/45
How much time is needed to produce 800 Joules of work if 60 watts of power is used? T=work divided by power
T= 800/60
calculate wave length…
7m= 14m/s Divided by F
F=2 Hertz
For a wave to be longitudinal it has to have______ and _______ compressions and rarefactions
A wave with a lot of waves is high or low amplitude high amplitude
A wave with low heights is a high or low amplitude? Low amplitude
We measure the wave length of a transverse wave from ____ to ____ or ______ to ____ crest to crest or trough to trough
We measure wave length in a longitudinal wave from _____ to ____ or ______ to _____ compression to compression or rarefaction to rarefaction

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