GChemOChem - Substitution, Addition, and Lab Techniques Flashcards
torque causes _____ acceleration
rotational
t=FrSIN(angle)
F - force applied
r-distance from pivot to the FOrce
angle between r and the line of the force
dynamic equilibrium is when an object is moving with _____
constant velocity
Note that torque is zero if the forces acts through the _____ so that could be if r=0 pr angle=0 or 180
pivot point
what is the angle to get the maximum possible torque with
90 degrees
work moves ___ around. The unit is
energy. Joule (J)
W=Fdcos(angle)
angle between force and distance
practice cos and sin angles
centripetal force does ___ work because it is always perpendicular
zero
Kinetic energy=1/2mv(squared)
energy it has because it is moving
Energy is the capacity to do __-
work
Gravitational potential energy. Ep=mgh or U=mgh
height above the reference point
Elastic potential energy is Fs=-k(change)x
This is Hooke’s Law
Potential energy of a spring is Us=1/2k(change)xsquared
electric potential energy. Opposites ___ and like charges __
attract, repel
conservative forces do not change the total energy and they are potential energy the three are
gravity, elastic spring force, electric force
Power is the rate at which work is done, the work (or energy) per ____
second
Work and __ are synonymous
energy
Power is scalar
P=Fvcos(angle)
P=W/t
Powers is the ___ at which work or energy is done
rate
thermally isolated means the system cannot exhange any __ with its surroundings
heat
dynamic equilibrium is constant ____
velocity
Pulley is Fout+NT
N is the number of times the rope pulls up on output
Lever is MA=Lin/Lout
where l is length. We can either have a smaller force over a greater distance (arm). Or a greater force over a shorter distance (crowbar acting on a nail)
Mechanical advantage is ___ divided by __
MA=out/in
specific is divided my __
mass
Machine uses a smaller force to do the same amount of ___
work
Forces exerted by a person are non-conservative forces. The non conservative forces are any pushing or pulling applied force and friction. What are the conservative forces?
gravity, spring force, and electric force
