Speed, Velocity, and Acceleration Notes

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PS.8a
Motion, Speed, Velocity, &

Acceleration

Motion is an object’s change in position relative to a
reference point.

Examples:
The Earth’s surface is often used as a reference point.
Trees or other buildings are also often used as a reference
point.

Motion, Speed, Velocity, & Acceleration

Motion:

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Speed is the
distance traveled in
a certain amount of
time

Units for speed:

km/hr
cm/s
m/s

.

Normally, objects do
not travel at a
constant speed.

What stops the
objects from
traveling at a
constant speed?

.

SPEED

FORMULAS

SPEED

Motion, Speed, Velocity, & Acceleration

What is the speed of a sailboat that is traveling 100 meters in
120 seconds?

Example 1

Example 2

Example 3

Timothy runs 51 meters in 14 seconds. What is his speed?

Calculate the speed for a car that went a distance of 125
kilometers in 2 hours time.

Motion, Speed, Velocity, & Acceleration

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VELOCITY

Velocity vs. Speed

Example 1

Example 2

Example 3

VELOCITY is the speed of an object in a PARTICULAR

DIRECTION.

Velocity differs

from speed

because it has a

specific
direction.

If a runner is

running east at
10 m/s, what is
her velocity?

A plane flew east
10,000 km, from

Virginia to France in
24 hours. What was
the velocity of the

plane during its flight?

What is Xander’s
velocity if he runs
200 meters toward
the school in 120

seconds?

Motion, Speed, Velocity, & Acceleration

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Accleration

Acceleration is the rate

at which speed or
velocity changes.

It can be an increase in

speed, a decrease in
speed, or a change in

direction.

Units of acceleration are

m/s²

As speed or velocity increases, so does acceleration.
As speed or velocity decreases, so does acceleration.

Increasing & Decreasing Speed

Changing Direction

Constant Speed or Velocity

Acceleration changes when there is any

change in direction.

When there is CONSTANT speed or velocity,

there is NO ACCELERATION..

Motion, Speed, Velocity, & Acceleration

Poll

Geese fly 23mph to the south when they migrate in the winter.

• Speed

• Velocity

• Acceleration

Poll

Geese fly 23mph to the south when they migrate in the winter.

• Speed

• Velocity

• Acceleration

Multiple Choice

How do you calculate average speed?

• distance divided by time

• time divided by speed

• speed divided by time

• total distance divided by total time

Multiple Choice

The change in position over time is called

• speed

• motion

• velocity

• acceleration

Multiple Choice

A car travels 120 miles in 12 hours. What is the car's speed?

• 10 mph

• 10 m/s

• 240 mph

• 240 m/s

Multiple Choice

A train travels 225 kilometers in 2.5 hours. Calculate the train's speed.

• 95 mph

• 90 km/h

• 90 h/km

• 90 m/s

Multiple Choice

The formula d/t is used for calculating ________ and ________.

• motion/position

• speed/acceleration

• velocity/motion

• speed/velocity

Multiple Choice

What is the difference between the velocity and the speed of an object?

• Velocity is the change in distance over time, while speed is the change

  velocity over time.

• Velocity has a direction associated with it, while speed has no specific

  direction.

• Velocity has no direction associated with it, while speed has a specific

  direction.

• Velocity is the change in speed over time, while speed is the change in

  distance over time.

Multiple Choice

Which of the following best describes the acceleration of an object?

• 50 m/s

• 50 m east

• 50 m/s east

• 50 m/s2

Explanation Slide...

Velocity= Speed and Direction

Explanation Slide...

Velocity= Speed and Direction

Poll

The motorcycle slowed down as it approached the yield sign.

• Speed

• Velocity

• Acceleration

Explanation Slide...

Acceleration- Change in Speed.

Poll

A snail can crawl 2 meters in 2 hours.

• Speed

• Velocity

• Acceleration

Explanation Slide...

Speed- Dividing distance and Time will calculate speed.

Poll

The race car sped into the turn as it went around the track.

• Speed

• Acceleration

• Velocity

Explanation Slide...

Acceleration- Change in speed.

Poll

The tornado is traveling northwest at 20mph

• Speed

• Velocity

• Acceleration

Explanation Slide...

Velocity- speed and direction

Poll

The jogger ran 3miles in 28 minutes.

• Speed

• Velocity

• Acceleration

Explanation Slide...

Speed- Distance and time are used to calculate speed.

Poll

The horse ran 44mph to win the race.

• Speed

• Velocity

• Acceleration

Explanation Slide...

Speed- Distance and time are used to calculate speed.

Poll

The boat traveled toward China at 8knots.

• Speed

• Velocity

• Acceleration

Explanation Slide...

Velocity- Speed and Direction.