Flashcards in key terms Deck (28)
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1
speed
How fast something is moving regardless of direction
2
Displacement(s)
How far an object has travelled from it's starting point in a given direction
3
velocity(v)
The rate of change of an objects displacement
4
Acceleration(a)
The rate of change of an objects velocity
5
Free fall
the motion of an object undergoing an acceleration of g
6
Transverse waves
vibration is at a right angle to the direction of travel
7
longitudinal waves
Vibrations are along the direction of travel
8
stopping distance
thinking distance + braking distance
9
Galileo said...
all objects fall at the same rate (if you ignore air resistance)
10
friction
a force that opposes motion
11
Terminal velocity
when the friction force equals the driving force
12
density
mass per unit volume
13
pressure
force per unit area
14
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.
15
moment
turning effect of a force
16
couple
a pair of forces
17
power
work done per second
18
Hooke's law
extension is proportional to force f=kx
19
Ultimate tensile strength
maximum stress a material can take
20
impluse
change in momentum
21
Newton's first law
Velocity of an object will not change unless a net force is acts on it
22
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
23
Newton's third law
each force has an equal and opposite reaction force
24
current
rate of flow of charge
25
potential difference
work done per unit charge
26
ohms law
if temperature is constant, the current through an ohmic conductor is directly proportional to the p.d. across it
27
Kirchoff's first law
the total current entering a junction = the total current leaving it
28
