Physics All-In-One Cheat Sheet, Cheat Sheet of Physics

Download Physics All-In-One Cheat Sheet and more Cheat Sheet Physics in PDF only on Docsity! Physics Cheat Sheet 1 Units SI: m, kg, s area: m2, volume: m3 velocity: m/s, acceleration: m/s2 Common Conversions 1. 3600 s = 1 hour 2. 5280 ft = 1 mile 3. 1.094 yards = 1 meter 4. 1.609 km = 1 mile 5. 2.54 cm = 1in 6. 1 m/s = 2.237 mi/hr 7. 745.7 Watts = 1 hp (HorsePower) 8. 1 mL = 1 cm3 Common Physical Constants 1. c = 2.998× 108 m/s (Speed of Light) 2. g = 9.81 m/s2 = 32.2 ft/s2 3. gmoon = 1.62 m/s 2 ≈ 16gearth 4. G = 6.674× 10−11Nm2/kg2 5. Re = 6380 km (Earth Radius) 6. Rearth−moon = 60Re (Earth-Moon Distance) 7. Rearth−sun = 150 million km (Earth-Sun) 8. ρair = 1.2041kg/m 3 = 0.0012041 g/cm3 9. ρwater = 1 g/cm 3 2 Density ρ = m V Objects less Dense than Water will rise in Water. Objects less Dense than Air will rise in Air. 3 Motion: 1D Speed must be positive, velocity can be positive or negative vav = ∆x ∆t , v = slope of x vs. t curve aav = ∆v ∆t , a= slope of v vs. t curve Constant Acceleration Processes a = constant v = v0 + at x = x0 + v0t+ 1 2at 2 v2 = v20 + 2a∆x (Handy Eq.) Motion with Gravity: a = −g 4 Motion: 2D Constant Acceleration Processes ax = 0 ay = −g vx = vx0 vy = vy0 − gt x = x0 + vx0t y = y0 + vy0t− 12gt 2 Handy Eq. v2x = v 2 x0 v 2 y = v 2 y0 − 2g∆y v2 = v20 − 2g∆y Vector Velocity vx = v0cos(θ) vy = v0sin(θ) 5 More Motion Formulas R0 = v2 0 g sin(2θ) [Note: sin(2θ) = 2sin(θ)cos(θ)] ymax = v2 0 2g sin 2(θ) Tflight = 2v0 g sin(θ) y(x) = tan(θ0)x ( 1− x R0 ) R = R02 [ 1± √ 1− h ymax ] θmax range = π 4 + gh 2v2 0 6 Newton’s Laws of Motion 1. v = constant if Fnet = 0 2. Fnet = ma 3. Action = Reaction, F12 = −F21 4. F = −Gm1m2 R2 7 Forces Fgrav = −GMmR2 . Near Earth Fgrav = mg. Ffric = µN Fspring = −kx Fbuoy = ρV g Fdrag = 1 2CDρAv 2 vT = √ 2mg CDρA vT ( mi hr ) = 0.45566 √ m (ingrams) D(in mm) (spherical objects) 8 Energy units: Joules (N ·m) Energy is neither created nor destroyed 1 2 mv2 ︸ ︷︷ ︸ KE +mgh ︸︷︷︸ PE = 1 2 mv20 ︸ ︷︷ ︸ KE0 +mgh0 ︸ ︷︷ ︸ PE0 Types of Energy 1. Mechanical Energy 2. Thermal Energy 3. Electrical Energy 4. Magnetic Energy 5. Light Energy (Electromagnetic) 6. Sound Energy (Acoustic) 7. Chemical Energy 8. Nuclear Energy Power units: Watts (J/s) Power = Rate of Energy Flow Pav = ∆E ∆t 9 Circular Motion Centripetal means towards the center of the circle acentrip = v2 r , Fcentrip = mv2 r T = 2πr/v (T is period of motion) 2