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Howitzer on an Incline
# 1D60.15

Description: This demonstration shows the independance of hozizontal motion (the cart) and vertical motion (the ball's path) of a single system in a slightly different way than 1D60.10

Instructions: The Howitzer is attached to a Dynamics Cart. The track is inclined. The ball is shot perpendicular to the track when the cart passes a photogate trigger. The ball will land back in the cart. This result is not intuitive without a careful analysis of the freebody diagrams for the cart and the ball. It is most instructive to make the x-axis parallel to the incline, and then the diagrams will show that the x-component of the velocity and the acceleration is the same for the ball and cart. Thus, they will travel the same distance down the incline for a given time.

Hazards: Keep an eye on the ball. It sometimes forgets the physics principles involved and misses the cart.

Parts: PASCO Howitzer attached to a cart
PASCO dynamics cart track
Block to lift the track
PASCO ball

Purchased/Built: purchased

Quant. in Demo Room: 1

Source: Pasco Scientific

Demo References
The American Journal of Physics AJP 44(8),783 Some strobe pictures and drawings show the ball is always above the cart relative to the incline, but not always above the cart relative to the horizontal.
The American Journal of Physics AJP 43(8),732 Short note on inclined ballistic cart systems.
The American Journal of Physics AJP 42(4),326 Perform the howitzer and tunnel on an incline with the car starting at rest.

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