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HALL’s carriages

HALL’s carriages. Jamie Croteau and Michael Sheets. Experiment 1 Carts A (930g) and B (934g). Experiment 2 Carts A (930g) and B ( 934g + 1000g mass). One cart, Cart A (930g) (contains spring for launch) and two physics books

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HALL’s carriages

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  1. HALL’s carriages Jamie Croteau and Michael Sheets

  2. Experiment 1Carts A (930g) and B (934g)

  3. Experiment 2Carts A (930g) and B (934g + 1000g mass)

  4. One cart, Cart A (930g) (contains spring for launch) and two physics books The velocity of A was when a 1cm flag went through the photogate. We did two trials for experiment 3 and got an average speed of 121.2 cm/s. The books of course remained stationary as we held them to the table. Based on what the conservation of momentum equation states: mAvAo+mBvBo=mAvAf+mBvBf (both B velocities would be set at zero because the books did not move and the initial A would be zero as well) (930g)(0cm/s)+(3180g)(0cm/s)=(930g)(121.2cm/s)+(3180g)(0cm/s) 0=112716g*cm/s In this case we had one side of the collision be stationary, meaning the energy and momentum of the ‘crash’ was mostly wasted trying to break the static friction and the force of the hand on the books. Errors in this case may be simple photogate errors and the friction caused by the table of the wheels of the cart Experiment 3Cart A (930g) and stationary books

  5. Through our three experiments our results varied, with the most accurate being the first trial. A plethora of errors could have occurred on the trials causing skewed numbers, such as: the force of friction the table had on the carts (the heavier the object in this case would have the higher friction rate) we also had a little bit of trouble setting up the photogates at the start. This could also have had an effect of the trials, especially trial two. From these experiments, we can learn that collisions should conserve all energy (in a perfect world, whether they be inelastic or elastic, unless acted on by an outside force. We can see this in trial three where we had the outside force of a hand cause the books to remain perfectly stationary, instead of moving a tiny bit, which would have caused the equation to not zero out completely. In the first trial we see the result as being almost identical, but the mass of cart B was 4grams higher than Cart A causing more friction on cart B, thus B was slowed down more. In trial two we see the opposite of this because cart B had over 1000 grams more than cart A causing cart B to have much more momentum, overriding the frictional increase of the weight. Overall our experiment was successful, because I feel it demonstrated the momentum of collisions well. Conclusion

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