# Shared Flashcard Set

## Details

Physics #1
mcat physics
60
Physics
07/09/2009

Term
 highest point is reached when
Definition
 vertical velocity = 0
Term
 acceleration at the highest point is
Definition
 10 downward
Term
 when you see projectile motion think...
Definition
 vx is constant and ax =0
Term
 Vx =
Definition
 Vcostheta
Term
 Vy=
Definition
 Vsintheta
Term
 vertical motion is the same as a particle thrown upward with
Definition
 an initial speed Voy
Term
 horizontal motion is the same as a particle moving with
Definition
 constant horizontal speed of Vox
Term
 no change in motion unless
Definition
 a net force acts!
Term
 when you see Fnet=0 think
Definition
 a=0
Term
 when you see a=0 think
Definition
 Fnet=0
Term
 action and reaction forces always act
Definition
 on separate objects
Term
 maximum torque when theta=
Definition
 90 degrees
Term
 minimum torque when theta =
Definition
 0 degrees
Term
 clockwise torques are
Definition
 negative
Term
 counterclockwise torques are
Definition
 positive
Term
 work is zero when force and displacement are
Definition
 perpendicular
Term
 the centripetal force does
Definition
 no work
Term
 force needed to lift an object equals
Definition
 the weight of the object
Term
 rate of work means
Definition
 power
Term
 rate of energy change means
Definition
 power
Term
 using a pulley, ____ amount of work is done
Definition
 the same! only the force is less
Term
 in inelastic collisions, the total KE before is ___ than the total KE after
Definition
 greater than
Term
 in inelastic collisions ____ applies
Definition
 ONLY conservation of momentum
Term
 in elastic collisions ___ applies
Definition
 conservation of momentum and conservation of energy
Term
 temperature is a measure of
Definition
 the random kinetic energy of the molecules of a substance
Term
 two bodies in contact and in thermal equilibrium have
Definition
 the same temperature
Term
 conduction:
Definition
 direct transfer of energy from molecule to molecule through molecular collisions
Term
 convection:
Definition
 transfer for heat by physical motion of heated material (only in liquids and gases)
Term
Definition
 transfer of energy by electromagnetic waves
Term
 electromagnetic waves can
Definition
 travel through a vacuum
Term
 1 Cal =
Definition
 10^3 cal
Term
 specific heat:
Definition
 amount of heat required to raise 1 kg of a substance 1 degree
Term
 equation for the amount of heat gained or lost by a substance during a phase change
Definition
 Q=mLL=heat of transformation
Term
 temperature ___ during a phase change
Definition
 is constant
Term
 work done by a gas on its surroundings ____ the volume of a gas
Definition
 increases
Term
 work done on a gas ___ the volume of the gas
Definition
 decreases
Term
 area under the pv curve is
Definition
 work
Term
 work is ___ if volume is constant
Definition
 zero
Term
 change in internal energy equation:
Definition
 U= Q-W where...Q= heat to the body W= work done By
Term
 entropy of a ___ system ____ for all real processes
Definition
 isolated, increases
Term
 real process is
Definition
 irreversible
Term
 the entropy of a system can decrease as long as
Definition
 the entropy of its surroundings increases by at least that much (ex: refrigerator)
Term
 specific gravity
Definition
 ratio of a density of a substance to the density of water
Term
 density of water
Definition
 1 g/ cm^3
Term
 pressure depends on the density of
Definition
 the liquid but not of the object!
Term
 molecules of a liquid experience ___ forces:
Definition
Term
 surface tension:
Definition
 molecules feel an unbalanced force pulling them back toward the liquid ---therefore the cohesive forces dont cancel out
Term
 increased velocity means ___ pressure
Definition
 decreased
Term
 decreased velocity means ____ pressure
Definition
 increased
Term
 viscosity:
Definition
 measure of the frictional force in a fluid
Term
 a large youngs modulus means a large stress produces....
Definition
 only a small strain---means a strong material
Term
 strong materials have a ___ youngs modulus
Definition
 large
Term
 bulk modulus describes the change in
Definition
 volume of a material, young only deals with length
Term
 electron equals
Definition
 1.6 x 10^-19 C
Term
 electric field of a positive charge points
Definition
 away
Term
 electric field of a negative charge points
Definition
 toward (inward)
Term
 field lines reflect how a ___ charge would be accelerated in the electric field
Definition
 positive test charge
Term
 equipotential lines:
Definition
 the potential at every point along the line is the same
Term
 potential difference between any two points on an equipotential line is
Definition
 zero
Term
 work depends only on the potential difference of
Definition
 the two line and not on the path
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