Matter in Motion Matter in Motion
Jan 02, 2016
Matter in MotionMatter in Motion
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.
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.
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
Speed
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
equations
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
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
Velocity
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)
Diagrams of velocityDiagrams of velocity
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.
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.
Calculating AccelerationCalculating Acceleration
Average AccelerationAverage Acceleration: :
final velocity-starting velocityfinal velocity-starting velocity
time it takes to change velocitytime it takes to change velocity
2 Ways to have zero velocity
a) Remain at Rest
Constant Velocity
Circular motion
Velocity is changing so acceleration is changing.
You are constantly changing your direction.
Centripetal Acceleration
The acceleration occurs in a circular motion.
Examples
Ferris Wheel
Moon orbiting the Earth