General Physics (PHYS 111) Week 1
General Physics (PHYS 111) Week 1 PHYS 111
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This 4 page Class Notes was uploaded by snufkin on Monday September 5, 2016. The Class Notes belongs to PHYS 111 at San Francisco State University taught by Elaine Tennant in Fall 2016. Since its upload, it has received 163 views. For similar materials see General Physics 1 in Physics at San Francisco State University.
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Date Created: 09/05/16
Physics Notes: Week 1 Classical Mechanics: Physical Quantities time (seconds), length (meters), mass (kilo) SI Units (international system of units): kilo= 10 or 1,000 centi= 1 0 or 1 100 μ (micro)= 10 or 6 1 1,000,000 Ex. m→m 2.5cm 10⁻² −2 1 × 1cm = 2.5× 10 m or 0.025m Dimensional Analysis: Distance (m)= speed (rate in m × time (s) s → d = v × t (d= distance, v= velocity, t= time) Ex. distance (m) = acceleration ( m ) × time power s² m= m × s² s² 1 m= m ×s p s² 1= s ×s = s (2+ ) Set exponent equal to zero: 2 + p = 0 → p = 2 Ex. Time and Length can be solved for separately 1 − s = ( s² ) m = m × m 2 1 s = (s ) q m = m 2 1 2q s = s o= p 2 1 1= 2q p=2 1 q= 2 Problem Solving: 1. Draw a picture 2. Write down everything you know and want to know (* **include units) 3. Draw a diagram 4. Write down relevant equations 5. Solve for what you want 6. Plug in numbers and calculate 7. Units and direction Ex. Nerve fibers in humans can conduct nerve impulses a speeds up o 40 m . How far can an impulse travel in 5 s ec? s m v= 140 s → time= 5 s distance (m) = ? Equation: d= vt m d= (140 s × (5 s) d= 700 m 1 Dimensional Kinematics: ** denotes a vector (direction) f is final x is x i initial ∆= “change in” or x f i Position: x 0 position is the the new location from where an object was Distance: x f i distance is the total amount an object traveled Displacement: xf xi= ∆ x displacement is the amount traveled from the initial position Ex. A person walks 20 m north, then 10 m south. What is the distance? distance: 20m + 10m= 30m What is the displacement? Displacement: +20m 10m = 10m N Vectors: Scalars: magnitude magnitude units units direction displacement distance velocity mass time speed ⃗v = ⃗Δx average Δt speed = distance time Ex. A person walks 20 m north, then 10 m south.Δt = 10 s ec. What is the speed? speed = ditimece = 310s 3 ms What is the velocity? ⃗Δx 10m N m ⃗v = Δt = 10s = 1 s Ex. A dog walks 10m north, 2m south, then 8m north. It takes 10 s ec. 16m m Slope = 10s = 1.6 s Slope = velocity for position vs. time graphs distance= 10m + 2m + 8m= 20m displacement= 10m 2m + 8m= 10m N distance 20m m speed= time 10s = 2 s ⃗Δx ⃗xf − ⃗xi 16m −8m 8 m average velocity= Δt = tf − ti 10s − 7s = 3 s N instantaneous velocity= lim ⃗ x Δt→0 Δt = 6m −11m = 5 m 5 m N 10s − 9s 1 s s
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