MECHANICS - MOTION IN TWO DIMENSIONS - PROJECTILE MOTION NC State University Faculty Access

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Howitzer
# 1D60.10


Description: This demonstration shows the independance of hozizontal motion (the cart) and vertical motion (the ball's path) of a single system.

Instructions: The track with be leveled and the cart tested before you arrive. The "levelness" may very across the table in the room, so moving of the track to another location (even on the table) might throw off the level of the track.

The Howitzer is attached to a Dynamics Cart. The ball is shot straight up when the cart passes a photogate trigger. The ball then follows a trajectory and lands back in the cart. The cart must be moving at a constant velocity for this demonstration to work.

Hazards: Keep an eye on that ball, should it miss it's target (this is unlikely, but can happen) and roll around the room.

Parts: One PASCO Howitzer apparatus mounted on a cart
One dynamics cart track
One PASCO ball

Purchased/Built: purchased

Quant. in Demo Room: 1

Source: Pasco Scientific

Demo References
The Video Encyclopedia of Physics Demonstrations Disc 02-03 A ball is shot up from a moving cart and falls back into the barrel.
Hilton M-6b A steel ball projected upward from a moving car returns into the barrel.
Sutton M-99 A ball fired vertically from cart moving horizontally falls back into the muzzle.
Meiners 7-2.15 Instructor sits on a wheeled cart with a catapult to project a ball upward.
Meiners 7-2.16 As cart moves at constant velocity a cannon fires a billiard ball vertically. Details in Appendix, p. 545.
Meiners 10-2.2 A gun mounted on an air puck shoots a ball vertically.
Freier and Anderson Mb-24 A car on a track shoots a ball up before it rolls under a tunnel.
The Physics Teacher TPT 12(3),177 A description of a ball launcher mounted on an air track cart. It can fire a small projectile (1/2" dia.) 10-15 ft.
The American Journal of Physics AJP 41(4),580 A launching system for use with an air track cart.

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