Science / Horizontal Circular Lab
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Autor: anton 31 October 2010
Words: 397 | Pages: 2
Hypothesis: As centripetal force increases, so does the angle on an accelerometer.
Introduction: Fc is centripetal force, which always acts toward the center of the circle. This force acting toward the center is the centripetal acceleration. The acceleration is continuously changing because the direction of the object traveling in a circle is always changing, but the magnitude is the same. Therefore, a velocity change is a change in acceleration by definition. Velocity is always tangent to the circle.
-We can connect centripetal force with ΣF=ma.
Ex. 1) What is the instantaneous velocity?
μ= 1.80 r= 20.0 m
Procedure: See lab book.
m r t Ave. speed=(2 r)/t
Trial 1 44 kg 8.4 m 62 s 8.5 m/s 380 N
Trial 2 44 kg 8.4 m 63 s 8.4 m/s 370 N
Trial 3 44 kg 8.4 m 60 s 8.8 m/s 410 N
m θ Fc Measured
Trial 1 44 kg 42 Ñ” 390 N
Trial 2 44 kg 40 Ñ” 360 N
Trial 3 44 kg 45 Ñ” 430 N
Trial 1 3.0 %
Trial 2 3.0 %
Trial 3 5.0 %
Conclusion: I was successful in proving that when centripetal force increases, so does the angle on an accelerometer. (% Error < 20%)
Analysis: The ride we used, the swings, tilted in the process. Because the ride twirled pretty quickly, it was difficult to pick out one person, let alone someone in our physics group, to use to measure the θ. Therefore, we had to approximate the average θ. To fix this problem, we chose one large person to measure the θ with so we wouldnâ€™t lose sight of him or her and estimated the best average θ we could get using the protractor. Also, we had to stand afar and do this, so the distance and the drizzle of rain may have hindered our view. In this case, the significant figures would have been small. In order to measure the radius, again we used the actual personâ€™s feet method, in which I walk foot in front of foot from the center of the ride to the outer edge when the ride was in motion. Then we converted this bad calculation by multiplying the number of â€œNehaâ€ feet by 25.5 cm, then to m. The significant figures would have been very small, even after careful calculation. To fix this problem, I would try my hardest not to stumble repeatedly, and I also took the walk 3 times to check my previous measurements.
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