NTNUJAVA Virtual Physics Laboratory
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Information about this web site => Request for physics Simulations => Topic started by: dallasmavstc on November 24, 2008, 06:03:44 am



Title: Physics projectile
Post by: dallasmavstc on November 24, 2008, 06:03:44 am
A projectile is launched straight up at 141 m/s. How fast is it moving at the top of the trajectory? Suppose it is launched upward at 45 degrees above the horizontal plane. How fast is it moving at the top of its curved trajectory?


Title: Re: Physics projectile
Post by: lookang on November 24, 2008, 08:32:45 am
goto http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=745.msg2801#msg2801

use the applet embedded or
the jar file http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=745.0;attach=372

set
u = 141 m/s
alpha = 45 degree

select from menu to visualize the quality
ux =
vx =

click play

what do you notice about the vx (instantaneous velocity in x direction ) ?












hint: vx = 100 m/s
extra fact: notice vx = 100 m/s = ux (initial velocity in x direction) because it is a motion in x direction without any acceleration ( ax )  so it is unchanged :)


Title: Re: Physics projectile
Post by: Fu-Kwun Hwang on November 24, 2008, 07:41:43 pm
If air resistance is not considered in projectile motion. The only external force is gravitation force.
So projectile only accelerate in the vertical direction and the horizontal velocity is constant.