Physical Science Final

83 terms by maronson728 

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Review for FInal Exam

a constant slope on a distance time graph indicates

constant speed

velocities add by

vector addition

speedometers measure

instantaneous speed

a moving object does not accelerate if

its velocity remains constant

accelaration is represented by a

curved line

how fast a velocity is changing at a specific moment

instantaneous acceleration

the force that opposes the motion of objects that touch as they move past each other

friction

static friction is _____ than sliding friction

greater

what force(s) act on a falling object?

gravity and air resistance

in terminal velocity, the net force is

zero

drag

air resistance

projectile motion

the curved path an object follows

inertia

tendency to resist any change in motion

acceleration (formula)

net force/mass

momentum

an impelling force or strength

biggest universal force

gravity

A force that causes an object to move in a circle

centripetal force

pressure (formula)

force/area

fluid

flows and assumes shape of container

bernoulli's principle

as speed increases, pressure decreases

device used to change a force

hydraulic system

change in pressure is transmitted equally to all parts of the fluid

pascals principal

apparent loss of weight in an object placed in a fluid

buoyancy

g/cm^3 is the unit for

density

for work to be done on an object, the object has to ____

move

si unit of work

joule

work formula

force x motion

rate at which work is done

power

units of power

watt and horsepower

what is a machine?

a device that changes a force

to increase the work output, you must ___________

increase the work input

what is the mechanical advantage of a machine?

number of times the machine increases the input force

what is an inclined plane wrapped around a cylinder

screw

in a first class lever the fulcrum is always between the

effort force and resistance force

the IMA of a third class lever is always

less than one

______ of an object increases when work is done

energy

unit for energy

joule

if the mass of an object doubles, its _______________ doubles

kinetic energy

kinetic energy of an object is the direct proportion of its

speed

energey that is stored

potential energy

equation for potential energy

pe=mgh

kinetic energy+potential energy=

mechanical energy

c=

speed of light

_____ is the transfer of thermal energy because of a temperature difference

heat

the transfer of thermal energy with no overall transfer of matter is

conduction

the transfer of energy as waves move through space is

radiation

the transfer of thermal energy that takes place mostly in fluids is

convection

a material that conducts thermal energy well is called a

thermal conductor

the study of the conversion between heat and other forms of energy is called

thermodynamics

longitudinal waves have

compressions and rarefactions

transverse waves have

crests and troughs

sound waves are

longitudinal

________ waves vibrate perpendicular

transverse

________ waves vibrate parallel

longitudinal

what does amplitude measure?

greatest displacement of a wave from rest position

if two waves collide and form a temporary larger wave, the interference is

constructive

in a standing wave, where is there no displacement from rest position?

node

what standard measure is used to compare sound intensities

decibel

the change in frequency of a wave as its source moves in relation to an observer

doppler effect

what kind of waves are electromagnetic

transverse

warm objects give off more _________ radiation than cooler objects

infrared

what is the speed of light in a vacuum

3 times 10 to the 8th

objects that scatter SOME of the light are

translucent

combining equal amounts of the three primary colors of light produce

white light

when is light produced?

when electrons change energy levels in an atom

objects that transmit almost all of the light that it strikes are

transparent

what electromagnetic waves have the shortest wavelength?

gamma rays

refraction

bending of a ray of light

light of a single wavelength with all the waves lined up

laser light

angles of incidence and reflection make rays that are _______________ to a mirror

perpendicular

what is the image that appears to be behind a plane mirror?

virtual

when light exits a vacuum and enters another medium, it

slows down

what is the speed of light in a material that slows compared to the speed of light in a vacuum

index of refraction

unit for current

amp

unit for resistance

ohm

a material that has almost zero resistance at low temperatures is a

superconductor

potential difference is measured in

volts

a complete path through which charge flows is a

circuit

where is magnetic force strongest?

poles

what is the angle between the direction a compass points and geographic north?

magnetic declination

ferromagnetic

materials that can be magnetized

voltage can be induced in a conductor by a changing magnetic field

Farady's law

what converts mechanical energy into electrical energy?

generator

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