• 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...

Introduction

AL Physics TAS 1

Centripetal Force

(2008/11/12)

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,

image00.png

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.

Middle

1.39

0.800

0.1400

1.37

12.03

12.66

12.35

10.1

1.59

0.750

0.1600

1.57

12.92

13.06

12.99

9.67

1.35

0.750

0.1800

1.77

11.75

11.72

11.74

10.7

1.65

Table 1

5. Errors and Accuracy

After calculations, the fractional errors are summarized as follow:

image01.png= ±2.60×10-3

M / kg

(±5×10-5)

L / m

(±5×10-4)

image02.png

t

...read more.

Conclusion

Increase number of revolutions (say 30 revolutions.)

Precautions

  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 ~

P.

AL-PHY-TAS 1

...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

    Determination of the acceleration due to gravity (g)

    4 star(s)

    Additionally, to reduce the error of measurement for time, I can improve on this by implementing better techniques and equipments. Except by using an electronic timer, I also used a ticker timer and a light gate to find out g .

  2. 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

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

    - 0.4 9 - 0.37 9.73 - 0.36 10 - 0.35 10.28 4 0.45 8.88 - 0.44 9.09 - 0.42 9.52 - 0.4 10 - 0.41 9.76 4.4 0.48 9.17 - 0.44 10 - 0.46 9.57 - 0.49 8.98 - 0.44 10 4.8 0.49 9.8 - 0.5 9.6 - 0.54

  2. 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.

  1. Objective To find the acceleration due to gravity by means of a simple ...

    The significant figure of measuring time is 0.01s. It is smaller than the error caused by human reaction. It is a kind of random error. Considering the final result of the experiment, this error will lead to more time measured.

  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 ()

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

    Moreover, ?=, where m=mass of the rubber bung,l=length of the nylon thread, ?=angular speed and t= time taken for complete revolution. Procedure 1. First, weigh and record the mass of the rubber bung(m) in table 1. 2. Construct the experimental setup as shown in Figure a.

  2. Force of friction

    The moving block was pulled at a constant speed. The applied force () from the spring balance was recorded. 7. Steps 5 and 6 were repeated by topping one wooden block at a time until all blocks have been used.

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