Projectiles
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- Pages: 20
Target Practice
Projectiles How to describe 2 dimensional Motion? Horizontal and vertical separately Ex) cannonball, shotput, baseball,
Projectiles
the two components act independently of each other. The only force (once it leaves the barrel or hand or racket or...…) is gravity. therefore the only acceleration is in
Projectile Demos
fire a projectile horizontally with
no vertical component!
Demo - two balls -Ball A is dropped at the same instant as Ball B is projected.
Projectile Demos
H-ITT– Which will strike the ground first? yellow first red first Both at the same time
H-ITT - Fire a bullet horizontally at the same time that a bullet is dropped. Which bullet will hit the ground first? A- Fired first B – Dropped first C – Both at the same time
H-ITT- What will change in the previous demonstration if the horizontal velocity of the bullet increases? A- Both hit at the same time just further from the gun B – Fired bullet first C – Dropped bullet first
DEB
A ball is thrown horizontally at 8 m/s with no vertical component. Q – Draw the FBD for the ball after it has left the persons hand. Q – What is the vertical acceleration? Q – What is the horizontal acceleration?
DEB
Fill in the v vs t table for the horizontally projected ball at 8 m/s.
Time (s)
0 1 2 3
Vhoriz
Vvert
(m/s)
(m/s)
8
0
DEB
Fill in the v vs t table for the horizontally projected ball at 8 m/s. Time (s)
Vhoriz
Vvert
(m/s)
(m/s)
1
8
-10
2
8
-20
3
8
-30
0
8
0
How to Solve Projectile Motion Problems 1. Write down everything you know vertically and horizontally in two separate columns. vf vi d a t Remember the following factoids 2) The acceleration vertically is always –9.8 m/s/s. Why? 3) The acceleration horizontally is always 0. Why?
How to Solve Projectile Motion Problems 4) If the ball is rolling horizontally it has no vertical motion and so the initial vertical velocity is 0. 5) If the ball starts and lands at the same elevation the vertical displacement is 0. 6) Up is + and Down is
How to Solve Projectile Motion Problems 6) Solve the motion problem with the dimension that has more information. Remember you need 3 of the 5 variables in order to determine the other 2. Choose the best equation. 7) The time horizontally and vertically must be the same.
How to Solve Projectile Motion Problems 8) Remember, a projectile problem is two problems in one. First – It is a simple motion problem horizontally with a =0 Second – It is a simple motion problem vertically with a = -9.8 m/s/s
Prob – A projectile launched horizontally P) A stone is thrown horizontally at 15 m/s from the top of a cliff 44 m high. A) How far from the base of the cliff does the stone hit the ground? B) How fast is it moving the instant before it hits the ground. DEB – List all the horizontal and vertical data.
The Soccer Kick/Baseball Throw Lab
Purpose: To determine how fast you can kick a soccer ball or throw a
Horiz
Vertical
a=
a=
d=
d=
t=
t=
Football – Hang Time
The angle of a kick helps determine how far it will travel.
The path is a parabola and is called a trajectory. Notice that the ball travels equal distances in equal times horizontally. Why? a = 0 While the distance vertically is increasing each time because a = 9.8 m/s/s
Projectiles How to describe 2 dimensional Motion? Horizontal and vertical separately Ex) cannonball, shotput, baseball,
Projectiles
the two components act independently of each other. The only force (once it leaves the barrel or hand or racket or...…) is gravity. therefore the only acceleration is in
Projectile Demos
fire a projectile horizontally with
no vertical component!
Demo - two balls -Ball A is dropped at the same instant as Ball B is projected.
Projectile Demos
H-ITT– Which will strike the ground first? yellow first red first Both at the same time
H-ITT - Fire a bullet horizontally at the same time that a bullet is dropped. Which bullet will hit the ground first? A- Fired first B – Dropped first C – Both at the same time
H-ITT- What will change in the previous demonstration if the horizontal velocity of the bullet increases? A- Both hit at the same time just further from the gun B – Fired bullet first C – Dropped bullet first
DEB
A ball is thrown horizontally at 8 m/s with no vertical component. Q – Draw the FBD for the ball after it has left the persons hand. Q – What is the vertical acceleration? Q – What is the horizontal acceleration?
DEB
Fill in the v vs t table for the horizontally projected ball at 8 m/s.
Time (s)
0 1 2 3
Vhoriz
Vvert
(m/s)
(m/s)
8
0
DEB
Fill in the v vs t table for the horizontally projected ball at 8 m/s. Time (s)
Vhoriz
Vvert
(m/s)
(m/s)
1
8
-10
2
8
-20
3
8
-30
0
8
0
How to Solve Projectile Motion Problems 1. Write down everything you know vertically and horizontally in two separate columns. vf vi d a t Remember the following factoids 2) The acceleration vertically is always –9.8 m/s/s. Why? 3) The acceleration horizontally is always 0. Why?
How to Solve Projectile Motion Problems 4) If the ball is rolling horizontally it has no vertical motion and so the initial vertical velocity is 0. 5) If the ball starts and lands at the same elevation the vertical displacement is 0. 6) Up is + and Down is
How to Solve Projectile Motion Problems 6) Solve the motion problem with the dimension that has more information. Remember you need 3 of the 5 variables in order to determine the other 2. Choose the best equation. 7) The time horizontally and vertically must be the same.
How to Solve Projectile Motion Problems 8) Remember, a projectile problem is two problems in one. First – It is a simple motion problem horizontally with a =0 Second – It is a simple motion problem vertically with a = -9.8 m/s/s
Prob – A projectile launched horizontally P) A stone is thrown horizontally at 15 m/s from the top of a cliff 44 m high. A) How far from the base of the cliff does the stone hit the ground? B) How fast is it moving the instant before it hits the ground. DEB – List all the horizontal and vertical data.
The Soccer Kick/Baseball Throw Lab
Purpose: To determine how fast you can kick a soccer ball or throw a
Horiz
Vertical
a=
a=
d=
d=
t=
t=
Football – Hang Time
The angle of a kick helps determine how far it will travel.
The path is a parabola and is called a trajectory. Notice that the ball travels equal distances in equal times horizontally. Why? a = 0 While the distance vertically is increasing each time because a = 9.8 m/s/s
