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Flashback
• Calculate the angular speed of– the second hand on an analog clock– the minute hand on an analog clock– the hour hand on an analog clock• (ω = Δθ/Δt)
ωs = 0.105 rad/sωm = 0.0175 rad/sωh = 0.000145 rad/s
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Symbols & UnitsQuiz on 2-3-2010
Circular MotionPhysics
Dave McCallister
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Symbol for time
t
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Unit for time
second (s)
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Symbol for distance
d
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Unit for distance
meter (m)
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Symbol for speed
v
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Unit for speed
meters per second(m/s)
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Symbol for acceleration
a
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Unit for acceleration
meters per second2
(m/s2)
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Symbol for force
F
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Unit for force
newtons (N)
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Symbol for mass
m
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Unit for mass
kilogram (kg)
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Symbol for work
W
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Symbol for kinetic energy
KE
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Symbol for potential energy
PE
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Unit for work & energy
joule (J)
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Symbol for power
P
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Unit for power
watt (W)
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Symbol for angular displacement
Δθ
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Unit for angular displacement
radians (rad)
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Symbol for arc length
s
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Unit for arc length
meters (m)
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Symbol for distance from axis
(radius)
r
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Unit for distance from axis
(radius)
meters
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Symbol for angular speed
ω
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Unit for angular speed
radians/second (rad/s)
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Symbol for angular acceleration
α
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Unit for angular acceleration
radians per second2
rad/s2
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Symbol for tangential acceleration
aT
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Units for tangential acceleration
meters per second2
(m/s2)
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Symbol for centripetal acceleration
aC
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Units for centripetal acceleration
meters per second2
(m/s2)
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Symbol for centripetal force
FC
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Unit for centripetal force
newtons (N)
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Symbol for gravitational force
Fg
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Unit for gravitational force
newtons (N)
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Front matter
• The following slide shows what circular motion formulas will be given to you on Thursday’s circular motion quiz.
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• Formulas:• θ(rad) = (π / 180°) x
θ(degrees)• Δθ = Δs/r• ωavg = Δθ/ Δt
• αavg = Δω/ Δt
• Δθ = ωI + ½ α t2
• ωF = ωI + α t
• ωF 2 = ωI 2+ 2α Δθ
• Δθ = ½ (ωF + ωI) t
• vT = rω
• aT = rα
• ac = vT2/r
• ac = rω
• Fc = mvt2/r
• Fc = mrω2
• Fg = G m1m2 / r2
• Constants:• G = 6.673x10-11 N m2/kg2