kinematics = study of motion
DESCRIPTION
Kinematics = study of motion. How many dimensions do we live in?. 4. How do you know something is moving?. Need frame of reference – backdrop. One -Dimensional (1-d) Motion Simplest type. What is motion? Define it!. 2. Are you in motion right now? Explain. - PowerPoint PPT PresentationTRANSCRIPT
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Do Now:
• Distinguish between distance and displacement.
• Which directions are positive?
• Which directions are negative?
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Kinematics = study of motion
How many dimensions do we live in?
4.
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1. What is motion? Define it!
2. Are you in motion right now? Explain.
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How do you know something is moving?
• Need frame of reference – backdrop.
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Objects In Motion
change position in space, along x, y, z relative to reference frame.
• Symbol for change .
• Means subtract:
• x = xf - xi.
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• Simplest form of motion is 1 dimensional or 1-d.
• Straight line motion .
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Speed & Velocity
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Speed & Velocity Scalar & Vector
• Speed rate an object covers
• distance – scalar (v)
• Velocity – rate of an object’s displacement - includes direction. (v)
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Speed = total distance/timeSCALAR. No direction indicated.
speed = d tot /t tot.
Velocity = displacement/time VECTOR. Includes direction.
v = x/t,
v= s/t v = d tot /t tot.
Vel direction/sign = displacement.
Average Speed & Velocity
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Text
• In class Problems pg 44 #1, 4, 6.
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1. A car travels 200 km north in 1.8 hours, turns and drives 30 km south in 0.6 hours.
Calculate the average:
a. Speedb. Velocity
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2. A bus travels 55 km west in 0.25 hours, stops for 30 minutes, turns and travels 145 km east. The eastward trip takes 2 hours. Calculate the average:
a. Speed
b. Velocity
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Equations are for average not instantaneous velocity.
Only if object travels at constant velocity, average = instantaneous.
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Read text pg 40 - 42
• Do Wksht Introduction to Motion
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Take out HomeworkJot down the answer in you notes.
• What is the acceleration of a turtle moving east at 0.25 m/s.
• A car driving west at 20 m/s slows to a stop. What is the sign of the acceleration?
• If a car is moving to the east, can its acceleration be west? Explain and give an example.
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Graphs of MotionPosition/Distance/Displacement – time
Constant v. What is the difference btw the 2
Starting point
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Uniform/ constant velocityv = slope. Calculate the velocity.
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Slope = 0
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Constant vs. Changing speed
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Displacement has direction includes neg quadrant.
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Describe what is going on
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Many objects in motion
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Uniform/Constant Acceleration
Instantaneous velocity = slope of tangent.
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Hwk Text Rd p 45 – 46. Do pg 69 #1 - 5, #10, #14.