Лабораторные работы / Решенная лабораторная по физике 10

The laboratory work N^o 10.

Study oscillations of the spring pendulum.

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

Checked by ______________________ date ____________

Purpose: to study the own oscillations of the spring pendulum and to define a periods of oscillations logarithmic damp decrement.

The order of performing a work:

1. Define by the scale a natural length of the right spring l₀.

2. To measure lengths of spring for three different cargoes in а position of equilibrium.

3. In each experience to evaluate a coefficient of spring resistance by the formula and to find the average meaning <k>. Write data in the table N^o1.

4. Suspend a cargo to this spring and to deduce a pendulum from a position of equilibrium, by displacing downwards on 2-3 millimetres, and to let off. Measure a time of 10 full oscillations (3 times for each cargo). Evaluate the average meaning of T. Write data in the table N^o2.

5. Construct the plot of dependence T² from the masses of cargoes m . using this plot and formula , to evaluate a coefficient of spring resistance. compare it with the meanings received by the first formula.

6. Make experience with the spring pendulum which cargo Is located in a vessel with water. S Deduce a pendulum from a position of equilibrium, by displacing downwards on A₀ = 2 mm, and to let off. Measure a time of 20 full oscillations (3 times) and the amplitude of oscillations after 20 oscillations. Evaluate the average meaning of <T₁>.

7. Evaluate the logarithmic damp decrement ; damping coefficient and coefficient of resistance . Write data in the table N^o3.

Table N^o1.

l0, m	m, kg	l, m	k, H/m	<k>, H/m
0.12	0.0637	0.195	8.3	8.8
	0.0877	0.2	10.7
	0.1	0.25	7.5

Table N^o2.

m, kg	t, s	T, s	T, s	T2, s2	k, H/m	<k>, H/m
0.0637	5.1	0.51	0.51	0.26	8.07	8.0
	5.3	0.53
	5.0	0.50
0.0877	6.0	0.60	0.6	0.36	8.05
	5.9	0.59
	6.1	0.61
0.1	6.5	0.65	0.65	0.42	7.9
	6.7	0.67
	6.3	0.63

Table N^o3.

m, kg	A0, mm	An, mm	n1	t1, s	T1, s	<T1>, s	<An>,mm	<>	, s-1	r, kg*s-1
	20	2	20	9.6	0.96	0.99	2.3
	20	3		10.3	0.103
	20	2		9.9	0.99

Conclusion:

So we have studied the own oscillations of the spring pendulum and to define a periods of oscillations logarithmic damp decrement.

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