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Black Hands

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Submitted By 0925342
Words 660
Pages 3
I.

Motion

Motion
• An object is in motion when it is undergoing a continuous change in position. – Position
• Location of an object
– Reference point
– Measurement scale

• Ex. table is about 3m from the door

Copyright © Houghton Mifflin Company. All rights reserved.

3-2

Motion
• Is described by using the fundamental units of length and time
• Combining the length and time will give you the time rate of change of position
– Basis of describing motion in terms of speed & velocity

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3-3

Speed & Velocity
• In Physical Science ‘speed’ and
‘velocity’ have different (distinct) meanings. • Speed – a scalar quantity, only magnitude – A car going 80 km/h

• Velocity – vector, both magnitude & direction – A car going 80 km/h north
Copyright © Houghton Mifflin Company. All rights reserved.

3-4

Vectors
• Vector quantities may be represented by arrows. The length of the arrow is proportional to magnitude.
40 km/h

80 km/h

-40 km/h

-80 km/h

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Section 2.2

2-5

Speed distance traveled
• Average Speed = time to travel distance
• v = d/t or v = Dd/Dt
– ( where D means ‘change in’)
– Over the entire time interval, speed is an average • Distance – the actual path length traveled
• Instantaneous Speed – the speed of an object at an instant of time (Dt is very small) – Glance at a speedometer
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Section 2.2

2-6

Instantaneous speed

Copyright © Houghton Mifflin Company. All rights reserved.

Section 2.2

2-7

Velocity
• Velocity is similar to speed except a direction is involved. displacement
• Average velocity = total travel time
• Displacement = straight line distance between the initial and final position w/ direction toward the final position
• Instantaneous velocity – similar to

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