To understand motion is to understand nature - Leonardo Da VinciLeonardo Da Vinci.
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Transcript of To understand motion is to understand nature - Leonardo Da VinciLeonardo Da Vinci.
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MotionChapter 1 in Motion, Forces, and Energy
To understand motion is to understand nature - Leonardo Da Vinci
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Objectives of Ch. 1 Sect. 1
• Determine when an object is in motion.
• Calculate an object’s speed and velocity.
• Demonstrate how to graph motion.
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Describing Motion Motion- if its distance from another
object is changing then an object is in motion
Reference point- a place or object used for comparison to determine if something is in motion
An object is in motion if it changes position relative to a reference point.
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Stationary objects These are objects that make good
reference points.
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Moving Reference PointsAre they reliable?
You are on Bus C looking at Bus D-oh my you are rolling backwards!!
Or are you?
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Nope!!! As a matter of fact, you’re not moving at all!
But Bus D did move forward!
Did you choose a good reference point?
C
D
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Relative Motion
Whether or not an object is in motion depends on the reference point you choose.
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From the Plane
The plane does not appear to be moving.
The skydivers appear to be moving. The Ground appears to be moving.
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Relative Motion From the Skydivers
The plane appears to be moving. The skydivers do not appear to be
moving. The ground is coming closer.
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Relative Motion from the Ground
The plane appears to be moving.
The skydivers are coming closer.
The ground is not moving.
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Measuring Distance
International System of Units (SI) To measure Use these units -Length -meter
-volume -liter -time -seconds -mass -kilogram
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You try…..
How many centimeters are in 22.5 m? Convert 1.6km to meters. Convert 119cm to meters. Convert 6548 m to millimeters.
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Calculating Speed
Speed= distance/ time s= d/t Possible units for speed are Kilometer per hour (km/hr) or Meter per seconds (m/s) *if you know the distance an object
travels in a certain amount of time, you can calculate the speed of the object.
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Average Speed
Total distance divided by total time traveled
To find average speed. › Bike race with hills-Can you have a
constant speed?
Total distance =32km + 13km = 45kmTotal time = 2 hr + 1hr = 3 hrs
15 km/hr
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Instantaneous Speed The rate at which an object is moving
at a given instant in time.
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Velocity Speed in a given direction
Velocity is important to prevent collisions
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Graphing Motion Time –x-axis (horizontal axis) Distance – y-axis (vertical axis) You can show the motion of an object
on a line graph in which you plot distance versus time.
A point on the line represents the distance an object has traveled at a particular time
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Calculating Slope Slope-steepness of a line on a graph
Slope= rise/ run Slope represents speed since:
› Rise=distance /run=time
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THE END OF THIS SECTION