• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Centripetal Force Experiment. Measure the centripetal force and compare it with the theorectical value Fc=mrω2

Extracts from this document...


AL Physics TAS 1

Centripetal Force


1. Objective

To measure the centripetal force and compare it with the theorectical value Fc=mrω2

2. Theory

Consider an rubber bung moving with constant angular speed in a circular path,


where θ is angle between string and vertical,

T is tension in the string,

m is mass of rubber bung,

g is acceleration due to gravity,

L is length of string,

r is the radius of circular path, and

ω is the angular speed of bung.

Theorectically, Mg=T= mω2L, where M is mass of weights used.

3. Method

Refer to the figure in the worksheet.

...read more.



























Table 1

5. Errors and Accuracy

After calculations, the fractional errors are summarized as follow:

image01.png= ±2.60×10-3

M / kg


L / m




...read more.


Increase number of revolutions (say 30 revolutions.)


  1. The rubber bung was tied securely and is whirled safely without hitting any person or object.
  2. Swith off the fan for more accurate measurment of mass.

Comparison of Experimental with Expected Result

Refer to Table 1, for M=0.1, 0.16 and 0.18, tension (2L) is smaller thanMg. For M=0.12 and 0.14, tension is larger than Mg.

Apart from errors, the main source of such difference is friction between glass tube and string.

Friction can act on the string either upward (when ω slightly decrease) or downward (when ω slightly increase).

For M=0.1, 0.16 and 0.18, friction act upward.

For M=0.12 and 0.14, friction act downward.

7. Conclusion

Taking the errors into account, Fc=mrω2 is verified.

~ End ~



...read more.

This student written piece of work is one of many that can be found in our AS and A Level Fields & Forces section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Fields & Forces essays

  1. Peer reviewed

    Investigating the forces acting on a trolley on a ramp

    5 star(s)

    level; For an angle of 10.8�; On a digital spirit level; angle = 10.8� � 0.1�. Thus, the percentage error is 0.93% (2d.p.) However using trigonometry; It is possible to use the sine rule to calculate the missing angle O; a / Sin A = b / Sin B =

  2. Peer reviewed

    Determination of the acceleration due to gravity (g)

    4 star(s)

    To avoid this problem, it would be better to do the whole experiment in the same place. In order to improve the experimental procedures, I think it is better to use an apparatus with a higher degree of accuracy. Such as a meter rule with the scale of millimetres standing

  1. Experiment test for F = m2L by whirling a rubber bung (centripetal force)

    (Assume there was no friction between the nylon string and the glass tube) Apparatus: Rubber bung, Glass tube, Screw nuts, Wire hook, 1.5m of nylon string, small paper marker, metre rule, stopwatch Procedures: 1. The rubber bung and the screw nuts were weighed to find their mass.

  2. Centripetal motion experiment. Objective To study the relationship between the angular speed and ...

    However, those in table 1 are not the same because of the experimental error. For example, the fan maybe turning on when performing the experiment. There is friction acting on the opening of the glass tube. And the rubber bung cannot be exactly whirled in constant speed and horizomtal plane.

  1. What are the physical quantities that affect the value of centripetal force when a ...

    ?t = ? 0.1 s 23.7 23.3 30.0 31.2 39.3 37.4 42.2 42.7 52.5 50.3 Average (t /s) 23.5 30.6 38.4 42.5 51.4 ? = / rad s-1 13.4 10.3 8.18 7.39 6.11 m?2L / N 0.937 1.11 1.05 1.14 0.974 Mean m?2L = 1.04 N Error analysis: Since the

  2. Measuring The Constant g; The Acceleration Due To Gravity

    clamps tightly with a knot to provide a strong pivot for the swing. 3) Use some Plasticine to make a ball approximately the size of a ping pong ball, and mould it around the end of the string , maintaining the ball shape, with the string now simply going inside its centre.

  1. Einstein's theory of relativity.

    The mass of an object increases with its velocity. Theoretically, the mass of an object would become infinite if its velocity became the velocity of light. This mass increase has been observed with experiments. A small particle of matter accelerated to 86 per cent of the speed of light has twice as much mass as it does when it is at rest.

  2. A1 Force of friction(TG)

    Limiting static friction (fL) 9.2 18.5 26.5 35.8 Kinetic friction (fk) 6.5 11.9 19.3 26.2 Normal force (R) 15.2 30.4 45.6 60.8 Mass (1 wooden block) = 1.52 kg The slope of the straight line () = 0.63 The slope of the straight line ()

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work