Physics Lab

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Patel Nil
Period 7
05/09/13
Static and Kinetic Friction
Objectives:-
* Use a Dual-Range Force Sensor to measure the force of static friction. * Determine the relationship between force of static friction and the weight of an object. * Measure the coefficients of static and kinetic friction for a particular block and track. * Use a Motion Detector to independently measure the coefficient of kinetic friction and compare it to the previously measured value. * Determine if the coefficient of kinetic friction depends on weight. Materials:-

* Computer - String
* Vernier computer interface- Block of wood with hook * Logger Pro- Balance or scale
* Vernier Motion Detector- mass set
* Vernier Force Sensor
Data Table:-
Part I Starting Friction
Mass of block| .0835kg|

Part II Peak Static Friction and Kinetic Friction
Total mass (m)| NormalForce(N)| Peak static friction | Average peak static friction(N)| | | Trial 1| Trial 2| Trial 3| |
.0835kg| .82N| .59| .50| .53| .54N|
.3335kg| 3.3N| 1.7| 1.26| 1.42| 1.46N|
.5835kg| 5.7N| 2.19| 2.91| 2.45| 2.516N|
.8335kg| 8.2N| 4.1| 3.34| 3.78| 3.74N|
1.0835kg| 10.63N| 5.14| 3.94| 4.06| 4.38N|

Total mass(m)| Normal force (N)| Kinetic friction| Average kinetic friction(N)| | | Trial 1| Trial 2| Trial 3| |
.0835kg| .82N| .238| .26| .249| .249N|
.3335kg| 3.3N| 1.02| 1.04| .92| .993N|
.5835kg| 5.7N| 1.8| 1.7| 1.71| 1.736N|
.8335kg| 8.2N| 2.12| 2.3| 2.45| 2.29N|
1.0835kg| 10.63N| 2.83| 2.7| 3.005| 2.845N|

Part III Kinetic Friction
Data: Block with no additional mass|
Trial| Acceleration (m/s2)| Kinetic friction force (N)| µk| 1| 2.857m/s2| .5805N| .2913|
2| 2.963m/s2| .6021N| .3021|
3| 2.638m/s2| .5360N| .2689|
4| 2.759m/s2| .5606N| .2813|
5| 2.635m/s2| .5354N| .2779|
Average...
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