matter in motion. measuring motion an objects change in position or location in a given time...
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Matter in MotionMatter in Motion
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Measuring MotionMeasuring Motion
An objects change in position or location in An objects change in position or location in a given time relative to a reference point.a given time relative to a reference point.
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A stationary location or object used to A stationary location or object used to determine whether or not an object moved. determine whether or not an object moved. AT that given time.AT that given time.
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Examples of References PointsExamples of References Points
TreesTrees MountainMountain BuildingsBuildings Planted gardensPlanted gardens Fire hydrantFire hydrant RockRock Light post Light post Street name Street name
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Speed
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SpeedSpeed
The distance traveled by an object divided The distance traveled by an object divided by the time traveled.by the time traveled.
Unit of measurement: m/sUnit of measurement: m/s
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equations
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Let’s Calculate SpeedLet’s Calculate Speed
1.) Kira jogs to a store 72m away in a time 1.) Kira jogs to a store 72m away in a time of 36 s. What was Kira’s average speed?of 36 s. What was Kira’s average speed?
STEP 1: Write the equation for average speedSTEP 1: Write the equation for average speed
Average speed: Average speed: total distance total distance
total timetotal time
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Let’s Calculate SpeedLet’s Calculate Speed
If you travel 7.5 m and walk for 1.5h what was If you travel 7.5 m and walk for 1.5h what was your average speed?your average speed?
STEP 1: Write the equation for average speedSTEP 1: Write the equation for average speed
Average speed: Average speed: total distance total distance
total timetotal time
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Velocity
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VelocityVelocity
The speed of an object in a particular The speed of an object in a particular direction.direction.
Unit of measurement: m/s(direction)Unit of measurement: m/s(direction)
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Diagrams of velocityDiagrams of velocity
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Two factors that change velocity:Two factors that change velocity:
1.) The Speed changes.1.) The Speed changes.
2.) The Direction changes.2.) The Direction changes.
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AccelerationAcceleration
The rate at which velocity changes. The rate at which velocity changes. (how (how quickly velocity is changing)quickly velocity is changing)
Unit of measurement: m/sUnit of measurement: m/s22(direction)(direction)
Example: an object accelerates if its speed, Example: an object accelerates if its speed, its direction or both change.its direction or both change.
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Calculating AccelerationCalculating Acceleration
Average AccelerationAverage Acceleration: :
final velocity-starting velocityfinal velocity-starting velocity
time it takes to change velocitytime it takes to change velocity
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2 Ways to have zero velocity
a) Remain at Rest
Constant Velocity
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Circular motion
Velocity is changing so acceleration is changing.
You are constantly changing your direction.
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Centripetal Acceleration
The acceleration occurs in a circular motion.
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Examples
Ferris Wheel
Moon orbiting the Earth