6) Mass = 30kg at constant velocity Angle = 40o horizontal µk= 0.3 Force needed to pull a mass =? Formula => ΣF = wsinθ+ µk wcosθΣF = w (sinθ+ µk cosθ) --------- equation 1 By putting the values in equation 1, equation 1 becomesΣF = 30x9.8 (sin40 + 0.3cos40)ΣF = 256.54Newton 2.1. Purpose/objective of the Experiment:
The physics concept tested in this lab was friction. The objective of this lab was to determine the coefficients of friction such the coefficient of static friction and coefficient of kinetic friction between the board and wooden block having side relative to each other. 2.2. Apparatus: 1)Wooden Board 2)Wooden Block 3)Slotted Weights 4)Weight Hanger 5) Pulley 6) Protector 7) Balance 2.3. Theory: Static friction can be described as the friction which occurs in case when the body is forced to move but the movement does not starts. In this case, a friction is produced which is named as static friction. Static friction is represented by fs. Kinetic friction can be described as the friction which occurs when the body is moving. If the force applied on the body is greater than the opposite force which tried to stop the body, then in this case the opposing force is known to be kinetic friction. The kinetic friction is represented by the symbol fk. The coefficient of the kinetic friction is basically can get by dividing the frictional force with the normal force. The symbol of the coefficient of kinetic friction is µk. The symbol of the coefficient of static friction is µs. The formula to determine the coefficient of kinetic friction and static friction are as follows. μk = FK/ N ---------------------eq. 1 μs = tanƟm-----------------eq. 2 2.4. Experimental Procedure: The wooden block was weighted, recorded and then placed on the board after placing mass of 200g on the block. Further, we started adding mass on the hanger until the block started moving with constant speed just after giving the small initial push to the block. This procedure was repeated with four other weights of 400g, 600g, 800g and 1000g. Readings were taken and the coefficient of kinetic friction was determined from generating the graph between normal force and frictional force. The experiment was set up again and placed mass of 600g on the block and the same procedure was repeated by adding mass on the hanger. Data was recorded and the coefficient of static friction was determined. Finally, the pulley was removed and the board was placed on the inclined plane and started moving it with the tip. The angle was measured and recorded and repeated the experiment for three independent trials.
3. Data and Observations: Weight of Wooden Block = 280.0g
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