Physics Cheat Sheet #2

Physics Cheat Sheet #2 - Does NOT depend on distance Linear...

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o V V at = + 2 1 2 o X V t at = + 2 2 2 f o V V a X = + tot E KE PE = + av F a m = Work F x = cos W F x θ = av F a m = 2 1 2 KE mv = 2 2 1 1 2 2 net f i W mv mv = - PE mgy = s F kx = - 2 1 2 s PE kx = ( ) w F x Power P Fv t t = = = Work: Scalar Quantity. KE: Scalar Quantity. Conservative Force: (gravity) Does not depend on a path. Non-Conservative: (friction/heat/sound) Depends on a path. Conservation of Energy: energy can’t be created or destroyed ONLY transferred from one form to another. ( ) Momentum p mv = u v net p F t = f i I F t mv mv = ∆ = - u v Momentum : Vector Quantity Impulse: Vector Quantity 1 1 2 2 1 1 2 2 i i f f m v m v m v m v + = + (used for Elastic and Inelastic). Elastic Collision : both momentum and KE are conserved. 1 2 1 2 ( ) i i f f V V V V - = - - Inelastic Collision: momentum is conserved but KE is NOT. 1 1 2 2 1 2 i i f m v m v V m m + = + 2 s r π = 2 360 = o s r = 1 dim av W ensions t t   = =     2 1 dim av w ensions t t α = f i W w t = + 2 1 2 i wt t ∆ = + 2 2 2 f i W w α θ = + 2 2 c v a w r r = = 2 c c v F ma m r = = t V rw = t a r = 2 2 t c a a a = + 2 v Tan mg m r = - is dimensionless and is a Vector Quantity. Angular: same acceleration, velocity and displacement.
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Unformatted text preview: Does NOT depend on distance. Linear: different acceleration, velocity and displacement. Depends on distance. **If there is constant speed , there may not be constant acceleration , and there is no constant velocity due to the change in direction. ** Centripetal Acceleration changes direction, Tangential Accel. Changes in magnitude. 1 550 746 ft lb Hp W s = = g 2 3 1 1 1 J Watt kg m s s = = g g 2 2 1 1 1 Joule N m kg m s = = g g g 2 1 1 / .255 N kg m s lbs = ⋅ = 1 lb = 4.448 N [1m = 39.37 in = 3.281 ft] [1 in = 2.54 cm] [1 km = .621 mi] [1 mi = 5280 ft = 1.609 km] [1km/h = .278 m/s = .621 mi/h] [1 mi/h = 1.61 km/h = .447 m/s = 1.47 ft/s]...
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