Study notes physci 105 less death Flashcards
Acceleration
Change in velocity(accel, decel, direction)
speed
measure of how fast something is moving
instantaneous speed
speed at a specified instant
velocity
both speed and direction
force
push or pull
net force
sum of all forces
weight
downward pull on an object resulting from gravity
average speed
distance during a period of time
Formula for acceleration
V(bar)=(Vf-Vi)/t
four fundamental forces
Gravity, Electromagnetic forces, Weak nuclear strong nuclear
accel of Gravity (g)
32 ft/s^2 or (9.8 m/s^2)
newtons 1st law of motion
(inertia) an object in motion tends to stay in motion inversely an object at rest tends to stay at rest
newtons 2nd law of motion
the acceleration of an object is directly proportional to the net force acting on it and inversly proportional to the mass of the object
newton defined in terms of what unit
mass: measured in kg, and acceleration: measured in m/s^2
mass is directly proportional to what?
inertia
formula for force
F=ma
what are the units of force (weight)
lb and newton
what are units of mass
kg
newtons 3rd law of motion
whenever 2 objects interact the force exerted on one object is equal in size and oposite in directiokn to the force exerted on the other object
formula for momentum
p=mv (momentum=mass*velocity)
universal law of gravitation
every object in the universe in attracted to every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distances between them (F=G((m1m2)/d^2)))
momentum
product of an objects mass and velocity
law of conservation of momentum
momentum always remains the same
impulse
change of momentum equal to a force times the time of application (delta)p= ft
centripetal force
force that pulls an object out of its stright line path
formula for period
T= 1/f
formula for speed
v(bar)= d/t
formula for average velosity
a=(Vf-Vi)/t
formula for velocity
(lambda)f —–wavelength* frequency
amplitude
max value of dispacement of a vibration
frequency
max number of vibrations in a second
hertz
the unit of frequency
waves
traveling vibrations or disturbances in a medium
transverse waves
particles move perpendicular to movement of wave
longitudinal wave
particles move parellel to movement of wave
sound (what kind of wave?)
longitudinal wave
disturbances of a wave are called?
condensations (crests) and rarefactions (troughs)
audible sounds
between 20-20000 Hz
