key terms Flashcards
(28 cards)
speed
How fast something is moving regardless of direction
Displacement(s)
How far an object has travelled from it’s starting point in a given direction
velocity(v)
The rate of change of an objects displacement
Acceleration(a)
The rate of change of an objects velocity
Free fall
the motion of an object undergoing an acceleration of g
Transverse waves
vibration is at a right angle to the direction of travel
longitudinal waves
Vibrations are along the direction of travel
stopping distance
thinking distance + braking distance
Galileo said…
all objects fall at the same rate (if you ignore air resistance)
friction
a force that opposes motion
Terminal velocity
when the friction force equals the driving force
density
mass per unit volume
pressure
force per unit area
Archimedes principle
when a body is partially or completely immersed in a fluid, it experiences an upthrust equal to the weight of fluid it has displaced.
moment
turning effect of a force
couple
a pair of forces
power
work done per second
Hooke’s law
extension is proportional to force f=kx
Ultimate tensile strength
maximum stress a material can take
impluse
change in momentum
Newton’s first law
Velocity of an object will not change unless a net force is acts on it
Newton’s second law
The rate of change of momentum of an object is directly proportional to the net force that acts on the object. f=ma
Newton’s third law
each force has an equal and opposite reaction force
current
rate of flow of charge
