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SOH CAH TOA
- Sin (θ)= O/H
- Cos (θ)= A/H
- Tan (θ)= O/A
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Joules derivation-using work formula
- W=F*d
- J=N*m
- J=(Kg*m/s²)*m
- J=Kg*m²/s²
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Joules derivation-using Energy formula
- KE=1/2mv²
- J=Kg(m/s)²
- J=Kg*m²/s²
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Watts derivation-using the power formula
- P=W/T Power=Work/Time
- W=J/s
- W=N*m/s
- W=(Kg*m/s²)(m/s)
- W=Kg(m²/s²)
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Vector
Magnitude + direction
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Displacement vs distance
- Displacement is how far you are from where you started in a straight line path,while distance is the total steps you took to get there regardless of the path.
- Displacement is a vector
- Distance is a scalar
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Velocity
- V=∆d/∆t
- Velocity equals the change in distance over time
- m/s
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****Note: Velocity includes both magnitude and direction, speed is only the magnitude
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Acceleration
- a=∆V/T
- Acceleration equals the change in velocity over time
- m/s²
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****Note: Since acceleration is proportional to Velocity, when velocity changes EITHER IN MAGNITUDE OR DIRECTION, acceleration changes!
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@Rest=no acceleration
Constant velocity=no acceleration
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Gravity 10(m/s)/s
- *Every second your velocity changes by 10m/s
- -Sec 0= 0m/s
- -Sec 1= 10m/s
- -Sec 2= 20m/s
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When is g positive or negative in a problem?
Consider the three variables: Acceleration (a), Velocity (V) and Displacement (d)
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*if all three point in the same direction, then it doesnt matter, they can all be + or -
*If one of them points in a different direction, then you have to pick a point of reference and stick to it.
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Which equation can be use when there is NO a? d=vt
distance=velocity*time
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Which set of equations is available when there is a?
- d=(Vavg)(t)
- d= Vi*t + (1/2)at²
- Vf²=Vi² + 2ad
- Vf= Vi + at
 or *When Vi=0
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In the graph of Displacement vs Time, what does the slope mean? Does the area under the curve have any meaning?
- The slope is Velocity
- No, the area under the curve is useless
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In the graph of Velocity vs Time, what does the slope mean? Does the are under the curve have any meaning?
- The slope is acceleration
- Yes, the area under the curve is displacement
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What's Newton's first law?
, then velocity is constant
*A body in motion will stay in motion if no there is no net force being applied on the body. Or a body at rest will stay at rest unless there is a net force being applied on the body
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What's Newton's second law?
Force=mass*acceleration
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What's Newton's Third Law?
Every force has an equal and opposite force
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