### Author Topic: Projectile motion with equations  (Read 31471 times)

#### Fu-Kwun Hwang

• Hero Member
•     • • Posts: 3062 ##### Projectile motion with equations
« on: February 09, 2008, 08:33:38 pm »
Projectile motion: acceleration a=-g is a constant in the vertical (y)direction.
It means that Vy(t)=Vy(t=0)+a*t =Vy(t=0)-g*t
The average speed from 0 to t is equal to
(V(t=0)+V(t))/2= V(t=0)+a*t/2= V(t=0)-g*t/2
because velocity change linearly.

So the distance traveled in y direction= average speed * t = V(t=0)*t - gt2/2
The distance traveled in x direction is Vx*t because velocity did not change in the horizontal direction.

This applet let you play with projectile.
You can adjust the initial (x,y) position of particle with mouse.
Drag the red arrow to change the initial velocity.
You can also change the above parameters with slider (x,y,vx,vy).
Equation for projectile motion with your initial conditions are displayed.
Click Initialize to reset time to zero and adjust new initial condition.
The simulation will remember the last three traces.
-*-

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
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Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!  #### lookang

• Hero Member
•     • • Posts: 1774
• http://weelookang.blogspot.com ##### Re: Projectile motion with equations
« Reply #1 on: September 22, 2008, 09:22:36 am »
you might be interested in this projectile motion by lookang too.

http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=745.0

enjoy

#### TaraLaster

• Newbie
• • Posts: 8 ##### Re: Projectile motion with equations
« Reply #2 on: December 18, 2013, 12:33:10 pm »
Projectile motion: acceleration a=-g is a constant in the vertical (y)direction.
It means that Vy(t)=Vy(t=0)+a*t =Vy(t=0)-g*t
The average speed from 0 to t is equal to
(V(t=0)+V(t))/2= V(t=0)+a*t/2= V(t=0)-g*t/2
because velocity change linearly.

So the distance traveled in y direction= average speed * t = V(t=0)*t - gt2/2
The distance traveled in x direction is Vx*t because velocity did not change in the horizontal direction.

This applet let you play with projectile.
You can adjust the initial (x,y) position of particle with mouse.
Drag the red arrow to change the initial velocity.
You can also change the above parameters with slider (x,y,vx,vy).
Equation for projectile motion with your initial conditions are displayed.
Click Initialize to reset time to zero and adjust new initial condition.
The simulation will remember the last three traces.
-*-

Kinda! 