physics test 3 Flashcards
Periodic motion
a motion that repeats itself identically after a fixed interval of time
examples of periodic motion
simple pendulum, the arms of a clock, the earth orbiting around the sun
oscillatory motion
A periodic motion taking place to and from or back and forth about a fixed point
Every oscillatory motion is periodic motion but
every periodic motion is not
oscillatory motion
Harmonic oscillation
The oscillation can be expressed in terms of a single harmonic function, i.e., sine or
cosine function is called harmonic oscillation
What is the relationship between spring constant K and frequency?
They are proportionately related
If the angular velocity of a rotating object changes, what is it?
tangential acceleration
What is the formula for inertia of a simple pendulum?
I = mr^2
Newton’s First Law for Rotation
An object rotating about an axis tends to remain rotating about the same axis at the same rotational speed unless interfered with by some external influence
Torque sign convention
counter-clockwise torque is
positive (+) and clockwise torque is negative (-)
what is K?
wavelenghth
A -wt indicates the wave is moving in what direction?
the positive x direction
What are the two main types of waves?
mechanical and electromagnetic
electromagnetic waves
no medium required
light, radio waves, x rays
mechanical waves
some physical medium is being disturbed
When it starts at 0 what graph is it?
sine
When it starts at a max, what graph is it?
cos
superposition
the combination of two waves at the same location
constructive interference
occurs from the superposition of two identical waves that are in phase.
destructive interference
occurs from the superposition of two identical waves that are 180° (𝜋radians) out of phase.
observer toward source
positive
observer away from source
negative
source toward observer
negative
source away from observer
positive
