1. Ballistic Pendulum

7. A ballistic pendulum is a device in which a projectile is fired into a pendulum, and after firing, the projectile and the pendulum swing together to some final height h. h

9. The speed of the projectile can be determined by using:
The conservation of momentum principle during the collision of the projectile with the pendulum
2) The conservation of energy principle after the collision, h

10. Use energy conservation after the collision:
Example
A 10.0 g bullet is fired into a 4.00 kg block which then swings to a height of m. Determine the speed of the bullet before the collision.
Use energy conservation after the collision:
Ep bot + Ek bot = Ep top + Ek top
mghbot + ½ mv2bot = mghtop + ½ mv2top
0 J + ½ mv2bot = mghtop + O J
½ mv2 = mgh
m = mbullet+mblock
v = m/s (speed of block and bullet after the collision)

11. Use conservation of momentum for the collision:
vbullet = 804 m/s

12. A ballistic pendulum experiment:
(metal rod versus watermelon)

14. A ballistic pendulum experiment: (metal rod versus watermelon)
(Out-take)