![]() “Pulse Time” is the time for one revolution of the mass. By default a radius value of 0.07 m is used. This formula can be found in Logger Pro under Data/Column Options, and then select Velocity. The photo-gate will measure the time (T) for the mass to complete one complete revolution. The tangential velocity is found by using a photo-gate timer and a calculation done in LoggerPro. The values of m and R can be directly measured from the Centripetal Force Apparatus (CFA). The force probe must then be secured in this position.ĥ. The movable mass must be located by having one partner hold the center of the mass at 70 mm while a second partner moves the force probe up until the string is taut. Place a 5 g mass on each side of the apparatus at the 70 mm marks. If you do not see these values then you either have to re-zero or re-calibrate the probe.Ĥ. Note: It is your responsibility to continually check the calibration of the force probe by first removing all mass and seeing if the probe reads 0N and then by hanging 500 grams on the probe and checking to see if it reads 4.9N. Enter the weight of this mass (4.90 N) and hit Keep. For the second calibration point, hang a 500 g mass from the sensor.For the first calibration point, do not apply any force to the sensor, enter 0 N, and hit Keep. ![]() You will now perform a two-point calibration of the force sensors: On the pop-up menu, select the force sensor and select Calibrate Now. Calibrate the force sensor by selecting Experiment/Calibrate. Under no circumstances should you supply the motor with more than 12 volts or 0.40A or you will burn out the motor!ģ. Carefully observe as your instructor or lab technician demonstrates the proper use of the Centripetal Force Apparatus. In this lab you will investigate how changes in m, v, and R affect the net force F needed to keep the mass in a circular path.ġ. Since the acceleration of an object undergoing uniform circular motion is v 2/R, the net force needed to hold a mass in a circular path is F = m (v 2/R). This net force is often called the centripetal force. Therefore the net force is also directed toward the center. ![]() In the case of an object moving in a circular path the acceleration is directed toward the center of the circle. This implies that an object moving at a constant speed in a circular path is accelerating.Īccording to Newton’s second law, a non-zero net force is needed to cause acceleration. An object moving in a circular path with constant speed does not have a constant velocity because the direction of the velocity is constantly changing. Constant velocity means that both the speed and direction do not change. Partners:_Īccording to Newton’s first law, a body in motion will remain in motion with constant velocity if the net force acting on it is zero. Period is inversely proportional to angular speed times a factor of 2 π 2\pi 2 π 2, pi, and inversely proportional to frequency.\) T T T T is period, ω \omega ω omega is angular speed, and f f f f is frequency SI units of radians s \dfrac T = ω 2 π = f 1 T, equals, start fraction, 2, pi, divided by, omega, end fraction, equals, start fraction, 1, divided by, f, end fraction Vector quantity with counterclockwise defined as the positive direction. The rotational analogue of linear velocity. Measure of how an angle changes over time. There are 2 π 2\pi 2 π 2, pi radians in a 360 ° 360 \degree 3 6 0 ° 360, degree circle or one revolution.
0 Comments
Leave a Reply. |