Transcript Projectile Motion - White River High School

7/21/2015
LEARNING TARGET: STUDENTS WILL BE ABLE
TO SOLVE 2 DIMENSIONAL MOTION
PROBLEMS
A ball is thrown with an initial velocity of 35 m/s at an angle of
39°. what are the X and Y components of the velocity vector.
35 m/s
Schedule:
PROJECTILE MOTION
Vector Review

Vectors have both…
1)
2)

Velocity is a vector because…
Velocity Vectors

In order to analyze a velocity vector you should
look at its ___ & ___ directions.
Newton’s

st
1
law
Newton’s 1st law states…
What does this have to do with projectile motion?
Horizontal Motion

The force of gravity could never alter the horizontal
velocity of an object since perpendicular components of
motion are independent of each other; vertical force does
not effect a horizontal motion.
Vertical Motion

The only force acting on the
falling object is gravity,
therefore the motion in the
vertical direction will follow the
same rules as an object in free
fall.
Projectile Motion

When both components are linked together using a
common factor you get Projectile Motion in 2
dimensions!
Check for Understanding
Which diagram (if any) might represent ...
a.The initial horizontal velocity?
b. The initial vertical velocity?
c. The horizontal acceleration?
d.The vertical acceleration?
e. The net force?
Check for Understanding

Supposing a snowmobile is equipped with a flare
launcher which is capable of launching a flare
vertically (relative to the snowmobile). If the
snowmobile is in motion and launches the flare and
maintains a constant horizontal velocity after the
launch, then where will the flare land (neglect air
resistance)?
Concept Check

Suppose an airplane drops a bomb while it is moving with a
constant horizontal speed at an elevated height. Assuming
that air resistance is negligible, where will the flare land
relative to the plane?
Shot Horizontally
Vertical Displacement Y
Horizontal Displacement X
The Common Factor?
Concept Check

A plane is flying precious fresh fish fillets to a Joe’s
Crab Shack under siege. If the plane flies at a speed of
150m/s at an altitude of 500m, how far away should
the plane drop the fillets.
FISH
Your Assignment

Due Tomorrow
 Practice
Problems
 Pg.
158
 9 - 11
 Applying
 Pg.
170
 19 - 22
Concepts
Learning Target: Students will be able to break
down the motion of a projectile.
A toy car is rolling off a counter at 1 m/s. the counter is 2
m tall. How far away will the car hit?
Assignment Questions
 Practice
Problems
 Pg.
158
 9 - 11
 Applying
 Pg.
170
 19 - 22
Concepts
Practice


Height = 2.0 meters
Vx = 5.0 m/s
Hit the



Using a ramp, a car, and photogate, construct a ramp
that will shoot out the ball horizontally.
A tiny cup will be placed on the floor to catch the ball.
Grading:
A: Ball in the cup
 B: Ball hits the cup
 C: Ball is within 3”
 D: Ball is within 6”
 F: Ball is outside the target!

Learning Target: Students will be able to break
down the motion of a projectile.
A school bus full of stunt children has a horizontal
velocity of 15m/s as it drives off of a 100 m cliff. How
far away from the cliff will the bus land?
Monkey and zookeeper
Monkey Intro
Monkey and zookeeper
Gravity Free
Monkey and zookeeper
Gravity On
Learning Target: Students will be able to break
down the motion of a projectile.
Find the horizontal (Vx) and vertical (Vy) components of
the cannonball after it was shot.
30m/s
40°
Initial Velocity


The total velocity can be thought
of as Two separate vectors!
This will be the basis for your
problem, two equations that are
related through time!
Shot with initial vertical velocity
Vertical Displacement Y
Horizontal Displacement X
Concept Check
A ball is thrown straight into the
air at 20m/s, how high does
the ball travel, what is the
hang time of the ball. How
far does the ball move in a
horizontal direction?
A ball is thrown into the air
at 45º with a velocity of
28.28m/s. how high does
the ball travel, what is the
hang time of the ball. How
far does the ball move in a
horizontal direction?
1 dimensional kinematics
A ball is thrown straight into the air at 20m/s, how
high does the ball travel, what is the hang time of
the ball. How far does the ball move in a horizontal
direction?
2 dimensional kinematics
A ball is thrown into the air at 45º with a velocity of
28.28m/s. how high does the ball travel, what is
the hang time of the ball. How far does the ball
move in a horizontal direction?
Concept Check

A softball is thrown at 70.0° at 5m/s, What is its
maximum height? How long did it take to land? How
far did it go?
Your Assignment


Read Section 7.2
Complete Projectile motion handout
 Show
all work in t-charts, if not enough room, draw
additional t-chart on your own paper.
 Due Tuesday
I wish I could
accurately predict
where a projectile
will land!
SHOW ME YOU ARE READY TO
START CLASS
Be in seat before Class starts
Quietly Waiting For instructions
Entry Task Paper on Desk
Class Time
10:49 – 12:16
7/21/2015
Learning Target: Students will be able to
analyze the motion of a softball.
A school bus full of stunt children is now advancing to
flying off jumps. The ramp is at a 40.0º angle, the school
busses velocity is 35 m/s, where will the soft landing
target need to be for a safe landing?

Projectile Motion Worksheet
 Give
a brief overview of how you completed your
portion of the problem
 The answer you got
Group
1
2
3
4
5
6
7
8
Problem
2
2
2
2
3
3
3
3
Section
1
2
1
2
3&4 5&6
3&4 5&6
For Today

Due:


Assignment
Pg. 172
 39 – 47 (odd)
Extra Practice
 Prob. 40 – 48 (even)


Projectile Motion
Worksheet
SHOW ME YOU ARE READY TO
START CLASS
Be in seat before Class starts
Quietly Waiting For instructions
Entry Task Paper on Desk
Class Time
10:49 – 12:16
Learning Target: Students will be able to
analyze the motion of a projectile.
A stunt skater is going to shock the world. He plans to jump
the worlds largest mammal, a blue whale. The whale is
15m tall, and 45m long. He can get a take off velocity of
25m/s from his 45° ramp, can he do it?
Softball Throw Lab
Objectives:
 1) Using time, distance, and vector analysis, determine velocity of ball
thrown into air.
 2) To find the best angle for throwing a projectile for maximum range.
 3) To apply knowledge to softball situations.
Materials: softball, stopwatch, football field.
Method:
 You will throw a softball several times at different angles and velocities
in order to get enough data to make a viable conclusion about the
physics of softball throwing.
Procedures:
 Design a lab procedure that will answer these questions using multiple
trials and will allow you to have the data to back up your conclusions.
Softball Throw Lab

Complete the softball throw lab
 Calculate
all your unmeasured items
 If you are participating in the velocity challenge find
your initial velocity and write it on the board
 Answer analysis questions in complete sentences.
For Today

Due:
 Softball
Throw Lab @
end of period

Assignment
 Pg.
172
 Prob. 39 - 48
Chuck Norris can pitch a softball at
74m/s. He can also hit that same pitch,
and make the catch… outside the park.
Physics Is a great work
out for your mind &
Body!!