. Measure the length of the plunger relative to the end cap of the dynamics cart
ID: 1436529 • Letter: #
Question
. Measure the length of the plunger relative to the end cap of the dynamics cart. Record the plunger length x in the data table. n.b., When the cart is placed so the end of the plunger bar is pressed against the end stop, we can measure the length of the plunger by measuring the distance from the end stop to the cart. 2. Completely compress the plunger spring on the cart and lock the spring in position by pushing the end of the plunger bar upward slightly so that one of its notches will catch on the metal rail inside the cart. 3. Put the plunger end of the cart against the end stop. The separation between the edge of the picket fence furtherest away from the end stop and the Photogate should be the length of the plunger bar when the spring is not compressed. 4. Click on the Record button to begin data collection. 5. Use the end of a pencil or similar object to tap down on the plunger release button. The cart will be pushed away from the end stop by the plunger spring. 6. Click on the Stop button to end data collection. 7. Repeat steps 2–6 two more times for a total of three runs. 8. Add additional mass to the cart and update the mass in the calculator. Usually the slotted masses can fit under the picket fence block in the accessory tray of the cart. The Photogate height may need to be adjusted so that it is still blocked by the 1 cm opaque bands. Record the mass of the cart, picket fence, and additional masses in the data table. 9. Repeat steps 2–6 three more times for a total of six runs altogether.
so Basicly a cart with a spring is being pushed on a track, when it hits a wall it bounces back and that force is recorded by a computer program.
from the above procedure name at least three possible sources of error. for each source say if it is more systematic or random. also state how each source of error would effect experimental results.
Explanation / Answer
1) average kinetic energy = ( 0.10 + 0.09 + 0.10 + 0.09+ 0.10 +0.10 ) /6
= 0.09666 J
elastic potential energy = 0.5 * 1980 * 0.010 * 0.010
= 0.099 J
=> percent difference = ( 0.099 - 0.09666)/(0.099) * 100
= 2.36 %
2) Elastic potential energy was larger in each case .
3) Energy Loss due to Force of Friction is possible reason for the differences in Elastic potential energy and average kinetic energy .
4) The elastic potential energy remain the same because with the increase in mass of the cart , the velocity of the cart decreases , so, the total kinetic energy remains the same . So, the elastic potential energy remain the same .
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