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Physics Final
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Gravity
Terms in this set (41)
scientific method
make an observation, ask a question, form a hypothesis, conduct an experiment, see results, draw conclusion
independent
changing variable on x axis
dependent
control variable on y axis
speed
rate of change in position, scalar
velocity
rate of change in position, vector
scalar
speed only
vector
speed and direction
examples of scalar
length and volume
examples of vector
direction and displacement
kinetic energy
an object that is in motion has this (bowling ball, snowboarder)
potential energy
stored energy (pulling back a bow)
centripetal
in the center, in a circle
center of mass
the point where all mass exists, the balance point
momentum
the tendency of an object to stay in constant motion (uses speed, mass, and direction)
velocity units
m/s
acceleration units
m/s2
force units
N
momentum units
kgm/s
impulse units
kgm/s
kinetic energy units
J
potential energy units
J
work units
J
weight units
N
centripetal acceleration units
m/s2
period of a pendulum units
s
two things positive acceleration means
speeding up in a positive direction and slowing down in a negative direction
vertical velocity
free fall -9.8
horizontal velocity
constant motion, no change in velocity
changes in velocity as a ball is tossed upward
acceleration is constant and velocity decreases by 9.8 until it stops
weight
the force due to gravity
mass
measures inertia
centripetal acceleration
force that causes centripetal acceleration acceleration must be an unbalanced force
what must be true about an object's center of mass for it to be stable
it has to be over the base of the support
when do you have to worry about relativistic effects
traveling close to the speed of light
Newton's First Law of Motion
an object in motion will remain in motion unless acted upon by another force
Newton's Second Law of Motion
F=ma
Newton's Third Law of Motion
for every action there is an equal and opposite reaction
Law of Conservation of Energy
energy cannot be created or destroyed, only transformed
Law of Conservation of Momentum
momentum cannot be created or destroyed, only transformed
Einstein's First Postulate
the laws of physics are the same in all inertial frames of reference
Einstein's Second Postulate
The speed of light is constant
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