Physics Lab

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 |