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science midterm sths

QuestionAnswer
tug of war that results in one team pulling another across the line is an example of force
friction needed to be overcome to get an object to move static
2 factors that affect friction mass and surface conditions
energy of objects at rest or stored potential energy
transfer of energy is called energy transfer
2 factors that affect how much elastic potential energy an object has material and stretch length
law of conservation of energy energy is not created or destroyed just changed
define energy ability to make things move
what is the relatonship between spring compression and distance traveled more spring compression, farther the distance traveled
what kind of relationship is elastic energy and compression linear relationship
a wave is a disturbance that carries energy through matter or space
the matter or stuff in which a mechanical wave moves through is called medium
waves that require or travel through a medium mechanical waves
particles in the medium vibrate perpindicular to the direction in which the ave is traveling longitudinal
longest wavelength radio
greatest energy radio
wavelenght just below what human eyes can see infrared
determined by the amplitude of the sound wave loudness
2 objects vibrate at the same frequency resonance
is determined by the frequency of the sound wave pitch
substances made up of only one type of atom element
period table organizes elements into groups that have similar what chemical properties
2 different isotopes of an element have a different atomic mass
solid ionic compunds have very high melting points because they have strong bonds
covalent bonds are usually formed betwwen A metal and a non metal
period across(horizontal) on periodic table
groups going down (vertical)
example of physical change bending, evaporation,dissolving
chemical changes occur when a new material is made
example of chemical change paint fading
differnt substances in a mixture do what keep their indiviual properties
chemical reaction that absorbs heat from the surrounding environment exothermic
synthesis combines elements
decompostion breaks down compounds
single replacement one element is replaced
double replacement 2 elements are replaced
absorbs heat endothermic
friction force that acts to reduce slipping betwween 2 surfaces
static friction friction of objects at rest
kinetic friection friction of objects in motion
electromagentic waves do not require a medium
transverse waves particles move perpendicular to the motion of the wave (0cean waves)
crest highest pint of a transverse wave
trough lowest part of a transverse wave
amplitude half the vertical distance between a crest and a trough
wavelengh distance from one crest to another
longitudinal waves particles vibrate parallel to the wave motion
compressions bunched up areas of longitudinal waves
rarefactions stretched out areas of longitudinal waves
wavelength distance between 2 compressions or 2 rarefactions
period time it takes to go from trough to trough or crest to crest
frequency how many crests or troughs pass by in a unit of time
isotopes atoms with a different number of neutrons
ions atoms with a change
groups tell you number of valence electrons
periods tell you number of energy shells
ionic bond compounds formed from strong attraction of ions
sound longitudinal wave
pitch how high or how low a sound is, faster frequency higher pitch
loudness depends on the amplitude, higher amplitude louder sound
Created by: c.montgomery
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