Flashback Calculate the angular speed of ωs = rad/s

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Presentation transcript:

Flashback Calculate the angular speed of ωs = 0.105 rad/s 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/s ωm = 0.0175 rad/s ωh = 0.000145 rad/s

Symbols & Units Quiz on 2-3-2010 Circular Motion Physics Dave McCallister

Symbol for time t

Unit for time second (s)

Symbol for distance d

Unit for distance meter (m)

Symbol for speed v

Unit for speed meters per second (m/s)

Symbol for acceleration

Unit for acceleration meters per second2 (m/s2)

Symbol for force F

Unit for force newtons (N)

Symbol for mass m

Unit for mass kilogram (kg)

Symbol for work W

Symbol for kinetic energy KE

Symbol for potential energy PE

Unit for work & energy joule (J)

Symbol for power P

Unit for power watt (W)

Symbol for angular displacement Δθ

Unit for angular displacement radians (rad)

Symbol for arc length s

Unit for arc length meters (m)

Symbol for distance from axis (radius) r

Unit for distance from axis (radius) meters

Symbol for angular speed ω

Unit for angular speed radians/second (rad/s)

Symbol for angular acceleration α

Unit for angular acceleration radians per second2 rad/s2

tangential acceleration Symbol for tangential acceleration aT

tangential acceleration Units for tangential acceleration meters per second2 (m/s2)

centripetal acceleration Symbol for centripetal acceleration aC

centripetal acceleration Units for centripetal acceleration meters per second2 (m/s2)

Symbol for centripetal force FC

Unit for centripetal force newtons (N)

Symbol for gravitational force Fg

Unit for gravitational force newtons (N)

Front matter The following slide shows what circular motion formulas will be given to you on Thursday’s circular motion quiz.

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