Lab Report: AL Physics Centripetal Force

AL Physics Centripetal Force(1ST Lab Report)

Objective :
To measure the centripetal force by whirling it around a horizontal circle, then compare the result with theoretical value FC = m(2r.

Apparatus :
1Rubber bung
1Glass tube (About 15 cm long)
1Slotted weights, with hanger 12 × 0.02 kg
1Nylon thread 1.5 m
1Paper marker
1Adhesive tape
1Metre rule
1Stop watch
1Safety goggles

Set-up:

Procedure:

1. Attach one end of a 1.5 m length of nylon thread to a rubber bung and thread the other end through a glass tube, a paper marker and a number of weights as shown.

2. First adjust the position of the marker so that it is about 1 cm near one end of the glass tube, and the length of the thread L from the other end of the glass tube to the rubber bung is, say, 0.8 m. Fix the position
Tsin[pic]=m(L sin[pic])(2
T=mL(2
The tension (T ) is provided by the weight(Mg).
By comparing the two values of tension, the expression of centripetal force F =mr(2 can be verified.

Precaution & Safety Measures ◆ Wear the safety goggles during experiment ◆ The angular speed of the motion should be kept constant so that the marker was always about 1 cm below the tube. ◆ Have all observations by standing away as the demonstrator rotates the rubber bung ◆ Make sure that you have plenty of room and you may rotate horizontal circular path. Also, switch off the fans. ◆ Ensure the rubber bung hold tightly with the string. ◆ Ensure the paper marker at the same position during experiment. ◆ Count the numbers of turns begin at 0.

Data:
(I)Readings
Measure the mass m of the rubber bung. m = 0.0316kg
Length of the string= 0.8m

|M / kg |Mg / N |Time for 20 revolutions 20T / s |Angular speed |m(2L / N