Title: For each diagram below, create a free diagram of the ball at the top of the path
1For each diagram below, create a free diagram of
the ball at the top of the path
- As you view the following video and animation
think about the forces in your free body diagrams
2-D Motion
2Independence of Motion
- Notice that the veridical motion of the projected
ball is identical to the vertical motion of the
falling ball - Notice that the projected ball travels forward at
constant speed
3Horizontal Component of Velocity
Newton's 1st Law
- Is constant
- Not accelerated
- Not influenced by gravity
- Follows equation
- dx Vixt 1/2axt2
0
4Vertical Component of Velocity
Newton's 2nd Law
- Undergoes accelerated motion
- Accelerated by gravity (9.8 m/s2 down)
- Vfy Viy at
- dy Viyt 1/2ayt2
- Vfy2 Viy2 2aydy
For all y-direction projectile equations ag
5Perpendicular components of motion are
independent of each other
6Independence of Motion
Please visit the Physics Zone Projectile Motion
Lesson Archer in Truck Proof III at
sciencejoywagon.com to access this video.
7This may be a useful way to organize your data.
Remember to solve x variables with x variables
and y variables with y variables. TIME links
the x and y variables
8Projectile fired at an angle
- As you view this video, notice the independence
of motion. - Notice that the vertical acceleration is downward
and constant - The ball slows during ascent and speeds up
during descent - When angles are involved, the appropriate
components of velocity must be used and the sign
used to indicate the direction of velocity and
acceleration is very important
9A bouncing ball captured with a stroboscopic
flash at 25 images per second.MichaelMaggs Edit
by Richard Bartz