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Kinematics 1 vectors displacement relative motion.notebook
1
August 29, 2013
Aug 2810:06 AM
AP Physics: Intro to Kinematics
• Scalars vs. Vectors• Distance and Displacement• Relative Motion
Kinematics ≡ study of motion independent of causes
Aug 2210:24 PM
Scalar VectorQuantities with Magnitude AND DirectionQuantities with Magnitude only.
Kinematics 1 vectors displacement relative motion.notebook
2
August 29, 2013
Aug 2210:33 PM
Position: (x) Location relative to a reference point. (Coordinate System)
Distance: a scalar, always positive. How far you have moved...
Displacement = change in position (∆x). a vector distance and direction.Displacement can be positive or negative
Aug 2210:40 PM
The new Call of Duty is about to come out and you just can't wait to school your friends. You leave your house at midnight and walk 2 blocks north to the exchange to wait in line for one of the first copies. You then walk 7 blocks south (back past your house) where your friends are waiting with controllers in hand. What is your total displacement? What is the total distance you walked?
Kinematics 1 vectors displacement relative motion.notebook
3
August 29, 2013
Aug 2211:06 PM
You drive 3 km north and then 4 km east. What is your distance? What is your displacement?
Aug 2210:48 PM
Relative Motion:
All motion is relative to an observer.
Kinematics 1 vectors displacement relative motion.notebook
4
August 29, 2013
Aug 2610:04 PM
What is the speed of the boy relative to me?What is the speed of the boy relative to the other passengers?What is my speed relative to the boy?
50km/hr3km/hr
Aug 269:26 PM
Velocity.notebook
1
August 29, 2013
Aug 2211:27 PM
Velocity: Rate of change of displacement (vector)(how fast your position or direction is changing)
Note for constant acceleration, average velocity can also be calculated with:
Aug 2211:30 PM
Velocity.notebook
2
August 29, 2013
Aug 2211:32 PM
Instantaneous Velocity ≡ limit of average velocity as ∆t approaches zero, (The velocity of an object at any given moment)
What does your speedometer show? Average Velocity or Instantaneous Velocity?
Aug 2211:34 PM
Finding Velocity from a position time graph (d/t)
y=mx+b