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Transcript
```Interactive Video Script Template
Course
Science 7
Lesson
Objective
Semester
A
Unit
5
Lesson
2
2.a. Students will define the terms velocity and displacement.
2.b. Students will describe how unbalanced forces acting on an object
change its velocity.
CLIP A (Introduction)
Visual
<Image>
<Fly image in from left, when audio is
done, fly image off towards right>
Audio
Objects are in motion all of the time. But
how do we describe this motion?
http://pixabay.com/en/bicycle-bike-bikingsport-cycle-384566/
<image>
Some common words that come to mind
are fast…slow…up…down.
http://pixabay.com/en/rocket-launchrocket-take-off-nasa-67643/
<Image>
<Show in a list>
We can summarize fast, slow, up and
down into one word: Velocity.
Fast
Slow
Up
Down
word velocity as the narrator says it>
<image>
VELOCITY
<Show images side by side>
<image>
http://pixabay.com/en/gauge-kilometersmiles-speed-152570/
<image>
http://pixabay.com/en/compass-eastnorth-south-west-152121/
Velocity describes the speed and direction
of an object.
<image>
A train’s motion can be described using
velocity. Its velocity could be sixty miles
Could its motion be described by
displacement?
http://pixabay.com/en/locomotive-steamlocomotive-train-222174/
<image>
Yes! Displacement is the difference in an
object’s position.
http://www.morguefile.com/archive/display
/860388
<image>
Think to yourself… can you combine both
velocity and displacement to describe the
motion of the leaves during fall?
http://pixabay.com/en/autumn-avenuetrees-548886/
<image>
http://pixabay.com/en/yes-consent-hookcheck-mark-board-238378/
If you said ‘yes’, you are correct! Today
we will explore both velocity and
displacement, along with how forces affect
an object’s velocity. Now, let’s see what
Question A
Stem: Which answer best describes a football’s velocity?
A.
B.
C.
D.
The quarterback threw the football fast!
The receiver caught the football while running down the field.
The referee caught a football that was moving 5 mph North.
The kicker scored a 30 yard field goal.
Correct Response (C)
(Video progresses to clip B)
Incorrect Response (A,B,D)
(Video progresses to clip E)
CLIP B (DOK1)
Visual
<image>
Audio
Think to yourself, how do objects begin to
move?
http://pixabay.com/en/primate-monkeyorang-utan-460871/
<image>
A contact force such as applied force and
an action-at-a-distance force such as
gravity are responsible for the motion of
some objects.
<image>
Motion occurs when forces are
unbalanced. Gravity is pulling these
raindrops down.
http://pixabay.com/en/drip-raindrop-waterwet-8763/
<image>
So, what happens to rain during a
hurricane?
http://pixabay.com/en/hurricane-earthsatellite-tracking-92968/
Question B
Stem: Which scenario best describes an object(s) in motion?
A.
B.
C.
D.
A piano is resting on the floor in the living room.
The piano is decorated with a fish bowl.
My music lesson book is stored on a bookshelf.
The cat jumps on the piano and knocks the fish bowl onto the floor.
Correct Response (D)
(Video progresses to clip C)
Incorrect Response (A,B,C)
(Video progresses to clip F)
CLIP C (Increased DOK2)
Visual
<image>
Audio
During a hurricane, wind applies a force to
the raindrops. This force causes the
raindrops’ velocity to change.
http://pixabay.com/en/key-west-floridahurricane-dennis-81664/
<image>
http://pixabay.com/en/reminder-bow-redribbon-hand-23771/
Remember, velocity describes the speed
and direction of an object.
<image>
Whenever a force is applied to an object in
motion, it can change an object’s velocity.
You can alter just the speed, just the
direction, or both speed and direction.
http://pixabay.com/en/blowball-dandelionwind-flower-411711/
<image>
It is key to remember that unbalanced
forces can change the velocity of an
object.
http://pixabay.com/en/blowball-dandeliongirl-blowing-384598/
Question C
Stem: Which answer best describes unbalanced forces acting upon an object?
A.
B.
C.
D.
Shoes resting on the floor
A ceiling fan turned off
Rolling a ball on the floor
Pushing a heavy box that will not move
Correct Response (C)
(Video progresses to clip D)
Incorrect Response (A,B,D)
(Video progresses to clip G)
CLIP D (Increased DOK3)
Visual
<image>
Audio
Now, what happens to an object’s
displacement if the object returns to its
exact starting point?
http://pixabay.com/en/tartan-track-careerrunway-609682/
<image>
If an object returns to the starting point, its
displacement is zero. Think of
displacement as how out of place an
object is.
http://pixabay.com/en/yo-yo-game-playingstring-153545/
<image>
It is key not to confuse displacement with
distance. A car may travel a distance of
fifty meters, but if the car returns to
exactly where it started. How out of place
is the car?
<image>
http://pixabay.com/en/puzzle-play-puzzlepiece-particles-97544/
Describing an object’s motion can
sometimes be tricky, but don’t let it puzzle
you. Let’s see what you remember…
Question D
Stem: A rock’s initial position is 50 meters above the ground. The rock falls 20 meters
straight down onto a ledge. As you are hiking by, you kick the rock 5 meters. What
distance did the rock travel?
A.
B.
C.
D.
25 meters
20 meters
75 meters
35 meters
Correct Response (A)
Incorrect Response (B,C,D)
(Video progresses to clip H)
CLIP E (Remedial 1)
Visual
<image>
http://pixabay.com/en/orange-fallingwater-fruits-275977/
Audio
Whoa! Look at this orange in motion! I
wonder how fast it was going, and how far
it fell?
<image>
When we measure the distance from an
object’s starting point to the object’s
ending point, we can describe its motion
by calculating its displacement.
http://pixabay.com/en/tape-measuremeasure-meter-length-269293/
<image>
We can also describe the motion of the
orange using the term velocity.
http://pixabay.com/en/orange-fallingwater-splash-fresh-165040/
<display images side by side>
<image>
The term velocity uses speed and
direction to describe the object’s motion.
http://pixabay.com/en/speedometertachometer-gauge-mph-153399/
<image>
http://pixabay.com/en/shield-directoryforward-avanti-468079/
Question E
Stem: Which term best describes the calculation between an object’s starting point and
finishing point?
A.
B.
C.
D.
Motion
Velocity
Acceleration
Displacement
Correct Response (D)
(Video progresses to clip B)
Incorrect Response (A,B,C)
(Video progresses to clip F)
CLIP F (Remedial 2)
Visual
<image>
Audio
There are two types of forces in the world.
‘Contact forces’ and ‘action-at-a-distance’,
(or ‘non-contact’) forces.
http://pixabay.com/en/world-earth-planetglobe-spaceview-549425/
<image>
Contact forces occur when two objects
touch each other. Just like when this pool
stick strikes a ball.
http://pixabay.com/en/billiards-pool-tablerack-balls-662827/
<zoom in towards center of image>
<image>
Action-at-a-distance forces occur without
objects touching each other. Gravity, the
attraction of an object towards the center
of the Earth, is a good example of this
type of force.
http://pixabay.com/en/world-earth-planetglobe-spaceview-549425/
<image>
http://pixabay.com/en/designate-pokingfinger-indicate-427537/
Both contact forces and action-at-adistance forces can change the velocity of
an object. Remember, velocity is the
speed and direction of an object.
Question F
Stem: Which best describes an action-at-a-distance force?
A.
B.
C.
D.
Gravitational Force
Applied Force
Contact Force
Air resistance
Correct Response (A)
(Video progresses to clip C)
Incorrect Response (B,C,D)
bringing students back to clip B)
CLIP G (Remedial 3)
Visual
<image>
Audio
When a force is applied to an object in
motion, its velocity can change. This
means that the speed of the object,
direction of the object, or both speed and
direction, can be altered.
http://pixabay.com/en/girls-boys-playingsoccer-407295/
<image>
When the soccer player applies a force
with her foot to the ball. The ball’s speed
and direction change.
http://pixabay.com/en/football-ball-soccersports-game-155528/
<image>
But instead of saying the ball’s speed and
direction changed, we say the ball’s
velocity changed.
http://commons.wikimedia.org/wiki/File:Ch
angwon_Soccer_Center_2.JPG
<image>
Think about it: When a hockey player hits
the puck with his stick, does the velocity of
the puck change?
http://pixabay.com/en/hockey-hockeyplayer-winter-sports-297445/
Question G
Stem: Which pair of words best describes the term velocity?
A.
B.
C.
D.
Speed and Acceleration
Space and Direction
Speed and Direction
Acceleration and Direction
Correct Response (C)
(Video progresses to clip D)
Incorrect Response (A,B,D)
(Video progresses to clip F)
CLIP H (Remedial 4)
Visual
<move ball along the direction of the
arrow>
<image>
Audio
Not only can we describe an object’s
motion with the term velocity, but we can
also use the term displacement, which
describes an object’s change in position.
http://pixabay.com/en/arrow-handdrawnblue-left-down-310599/
<image>
http://pixabay.com/en/oldtimer-auto-pkwdare-nostalgic-534872/
<image>
Sometimes it is easy to confuse distance
and displacement.
<image>
http://pixabay.com/en/peas-pod-pea-pod-
But don’t worry. Displacement becomes
clear if you think about how out of place
an object is.
green-fresh-580333/
<image>
Think about a book on a desk. It becomes
displaced when it falls off onto the floor.
http://pixabay.com/en/architect-deskoffice-workplace-569361/
Question H
Stem: Which term best describes how “out of place” an object is?
A.
B.
C.
D.
Distance
Displacement
Position
Velocity
Correct Response (B)