Лабораторные работы / Решенная лабораторная по физике 15

The laboratory work N^o 15.

Definition of the viscosity factor of a liquid by falling-ball method.

Have done by the student gr.__220473я__ F.N.S. Pavlov F.E.

Checked by ______________________ date ____________

Purpose: to study the effect of internal friction and to define the coefficient of internal friction (by falling-ball method).

The order of performing a work:

1. Define the diameter d of the ball.

2. Carefully to lower the ball on centre of a vessel, directly before water. Measure the time t of passage of a ball between labels on the vessel.

3. Measure a distance l between the labels on the vessel and the velocity V of the ball (4 times).

4. Evaluate the coefficient of internal friction by the formula and calculate <>.

5. The casual rejection is equal: ; a square rejection: . The error of results is:.

6. Write the result in the form .

Table N^o1.

d, m	r, m	l, m	t, s	V, m/s	, Pa*s	, Pa*s
0.0024	0.0012	0.5	4.27	0.1171	0.28	0.0125
0.0021	0.00105	0.5	4.05	0.1235	0.2	0.0675
0.0024	0.0012	0.5	4.86	0.1029	0.32	0.0525
0.0023	0.00115	0.5	4.45	0.1124	0.27	0.0025

Table N^o2.

<>, Pa*s	S, Pa*s	, Pa*s
0.2675	0.0502	0.0251

=0.26750.0251 (Pa*s)

Conclusion:

So we have studied the effect of internal friction and now we know how to define the coefficient of internal friction (by falling-ball method).

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