Matter in Motion. Measuring Motion An objects change in position or location in a given time relative to a reference point.

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