MOTION

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CHAPTER 1
MOTION
2
Whether or not an object is in motion depends on
the reference point you choose.
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RECOGNIZING MOTION
An object is in MOTION when its distance from
another
object is changing.
4
Calculating Speed
Most objects do not move at a constant speed.
Cyclists change their
Speed many times during a race.
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HOW TO FIND AVERAGE SPEED

• TOTAL DISTANCE / TOTAL TIME
• Suppose a cyclist travels 32 km during the first
  two hours and 13 km during the next hour.
• TOTAL DISTANCE 32km 13km
• TOTAL TIME 2 hours 1 hour
• Average speed 45km/3 hours 15km/h

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DESCRIBING VELOCITY
Speed in a given direction
velocity.
is called
If you know the velocity of the
Rollercoaster - you know two
things about its motion
Its speed and direction
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Changing Speed Direction

• hh

A basketball player
changes his direction
and speed depending
on what he sees on
the court.
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Golf ball motion
What are some
things that might
effect how far
and in what
direction the
golf ball might
travel?
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ACCELERATION

• Acceleration is the rate in which VELOCITY
• changes.
• Recall that velocity has two components
• (speed and direction)
• In science, acceleration refers to increasing
• speed, decreasing speed, or changing
• direction.

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ACCELERATION
CAN YOU IDENTIFY SOME CHANGES IN MOTION OF THE
SURFER?
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CALCULATING ACCELERATION

• Acceleration Final velocity - Initial velocity

Time
The unit for acceleration is written as
meters/second