# CO1-Projectile Motion ```FEDERICO A. ESTIPONA MEMORIAL HIGH SCHOOL
Laguinbanua, Mandaon, Masbate
S.Y.: 2020-2021
SCIENCE 9
Q4 WEEK 1:
Forces and Motion
PROJECTILE MOTION
MELC
Describe the horizontal
and
vertical motions of a
projectile.
At the end of this lesson, you will be able to answer the following questions:
•
How will you describe the horizontal and vertical motions of a
projectile?
•
What are the factors that determine the projectile’s flight?
•
What are other factors that may affect the motion of objects?
Elicit Prior Knowledge
Direction: Read each questions carefully then write the letter of the correct
1. It is a vector quantity that is defined as the rate at
which the object changes its velocity.
a. Acceleration
b. Projectile motion
c. Velocity
d. Gravity
Pre-Test
1. It is a vector quantity that is defined as the rate at which the
object changes its velocity.
a. Acceleration
c. Velocity
b. Projectile motion
d. Gravity
Pre-Test
2. It is defined as a vector measurement of the rate and
direction of motion.
a. Acceleration
b. Projectile motion
c. Velocity
d. Gravity
Pre-Test
2. It is defined as a vector measurement of the rate and direction
of motion.
a. Acceleration
c. Velocity
b. Projectile motion
d. Gravity
Pre-Test
3. A form of motion experienced by an object or
particle that is projected near the Earth’s surface and
moves along a curved path under the action of gravity
only.
a. Acceleration
b. Projectile motion
c. Velocity
d. Gravity
Pre-Test
3. A form of motion experienced by an object or particle that is
projected near the Earth’s surface and moves along a curved path
under the action of gravity only.
a. Acceleration
c. Velocity
b. Projectile motion
d. Gravity
Pre-Test
4. It is a force by which the planet or other body draws
object toward its center.
a. Acceleration
b. Projectile motion
c. Velocity
d. Gravity
Pre-Test
4. It is a force by which the planet or other body draws object
toward its center.
a. Acceleration
c. Velocity
b. Projectile motion
d. Gravity
Pre-Test
5. What is the accepted value of acceleration due to
gravity?
a. 9.8 m/s
b. 9.8 m/s/s
c. 9.8 m
d. 9.8 s
Pre-Test
5. What is the accepted value of acceleration due to gravity?
a. 9.8 m/s
c. 9.8 m
b. 9.8 m/s/s
d. 9.8 s
Unlocking Difficulties
Scalar Quantity vs.
Vector Quantity
Speed vs. Velocity
Displacement
Acceleration
Unlocking Difficulties
Scalar Quantity vs.
Vector Quantity
Scalar : It is the quantity that is fully
described by a magnitude only.
Examples:
Time, Distance, Mass, Area,
Speed
Vector : It is the quantity that has both
magnitude and direction.
Examples:
Force, Velocity, Displacement,
Acceleration, Momentum
Unlocking Difficulties
Speed is scalar quantity
Ex. 50km/h
Speed : It is the measure of how fast
something is moving.
Velocity is vector quantity
Ex. 50 km/h NE
The distance over time
(s=d/t)
Velocity : The speed and direction of motion of an object. It
is computed through displacement over time.
Unlocking Difficulties
Both displacement and acceleration are vector quantities.
Displacement: Change in position of an object with respect to its direction.
It can be computed through (d=velocity x time).
Acceleration : The rate of change in velocity in a given time or elapsed
time. It can be computed thru change in velocity over elapsed time.
Explore
Who among you play this
sports?
Motion in Two Dimensions
Vertical
component
Horizontal
component
What is a projectile?
Any object thrown in space under the sole influence of
gravity is called a projectile.
Which is an example of a projectile?
Identify the vertical and horizontal motion from point A to point E.
C.
B.
D.
E.
A.
1. What do you observe about the vertical velocity of the
projectile shown in the image?
2. What can you say about the horizontal velocity of the
projectile?
3. Did the horizonal and vertical motion of the projectile affect
one another?
Activity
Directions:
a. Guided by what you have learned about the horizontal and vertical motion of a projectile,
assign a value for the vertical and horizontal velocity of the projectile illustrated below.
b. Represent said values with arrows depicting the correct magnitude (length) of the arrow at
different points in the trajectory.
Concept Discussion
●
●
The horizontal component
of the projectile motion is
constant, meaning it does
not change throughout the
trajectory of the projectile.
The vertical component of the
projectile decreases as it
moves up, becomes zero at
the very top of the trajectory,
then increases as it nears the
ground.
●
●
●
The horizontal motion of the
projectile is affected by the Law of
Inertia (an object in motion remains
in motion at constant velocity);
The vertical motion of the projectile
is affected by gravity, its value is
9.8m/s2 down.
The horizontal and vertical
motion of a projectile are
independent of one another, they
do not affect each other.
Evaluation
•
How will you describe the horizontal and vertical motions of a
projectile?
•
What are the factors that determine the projectile’s flight?
•
What are other factors that may affect the motion of objects?
Questions?
Next week…
●
Investigate the relationship between the
angle of release and the height and range
of the projectile.
THANKS
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