Laboratory #4: Centripetal ForceTitle Page & Format __ (10 pt. max)Purpose & Introduction __ (10 pt. max)Experimental Details __ (10 pt. max)Results and Discussion __ (50 pt. max)Conclusions __ (15 pt. max)References __ (5 pt. max)Total Grade ___ Purpose and IntroductionThe purpose of this experiment was for students to observe centripetal forcethrough the utilization of the Pasco rotational system. When an object moves at a constant speed, it is said to be in a uniform circular motion and it experiences centripetal acceleration and centripetal force. Centripetal force is a force that acts on a mass moving in a circular path and is directed toward the center around which the mass is moving.
(1)*The centripetal force always points toward the center of the circle and continually changes direction as the object moves .The speed vof the rotating object is related to the period and the radius of the circle by:(1)According to Newton’s second law, whenever an object accelerates, there must be a net force to create the acceleration . The second law gives this net force as the product of the object’s mass m, and its acceleration v2/r. Newton’s Second Law:=∑?m * a(2)Experimental DetailsThe equipment needed for this lab are the PASCO super pulley (1), PASCO mass and hanger set (1), and lastly, a stopping watch (1). The PASCO centripetal force apparatus was setup in order to calculate the speed (v) of an object moving in a circle. The mass of the bob was weighed on the electronic mass scale, which came out to be 210g. The side post assembly was set to 16.00 cm. The weight hanger was then attached at the end of the hanging bob. The horizontal strings were leveled by pivoting the pulley. Weights were added until the vertical string was aligned withthe vertical indicator. The indicator was aligned with the indicator bracket which was done every time the radius changed. The platform was then rotated until the indicator disk was realigned with the indicator bracket. A digital timer was used to measure the time it took for 15 full rotations which were recorded in Table 1. These steps were repeated when the radius was changed to 17.00cm, 18.00, and lastly, 19.00cm.
Centripetal Force Apparatus #: 2Mass of Bob:_mbob=210g > .210kgTable 1: Measured Load and Measured Time for Fifteen Complete RotationsRadius of Path (cm)Mass of Load (g)Trial #1 (s)Trial #2 (s)Trial #3 (s)Trial #4 (s)Trial #5 (s)164725.0024.6726.0924.9723.76176820.5420.8720.9919.7019.96188717.9418.2718.2018.3218.391910017.4017.3617.3317.5517.67Table 2: Period of Rotation for each Trial