# Practical

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Practical 5 ________________________________________________________________________ To verify the conservation of spring and gravitational potential energy Objective: * To verify the law of conservation. Apparatus and Materials: 1. Spring 2. plastic / rubber ball 3. Spring holder 4. Metre rule Equipment: 1. Electronic balance Setup: Release h Compress
Metre ruler

Figure: 5-1 Theory: When spring is compress, the spring store potential energy:

The total energy E of a simple mechanical system is the sum of the potential energy PE and the kinetic energy KE. In the absence of friction the total energy E of the system is a conserved quantity so that E = KE + PE. In the absence of friction, if the KE and PE change, they must change so that their sum is equal to the total energy E. In this experiment several simple mechanical systems will be examined for this property. As the spring been release, the potential energy of the spring is converted to kinetic energy and after the ball reach the maximum high, the kinetic energy is equal to zero and transform to Gravitational Potential Energy.

at maximum height:

Procedure: 1. Measure the mass of the ball, m. 2. Compress the spring downward, record the vertical distance of spring as x and let it go. 3. Measure the maximum height, h the ball can achieve. 4. Repeat the step [2] and [3] to obtain eight (8) sets of data. 5. Tabulate: x, h and x2. 6. Plot a graph of x2 against h. 7. Determine the gradient of the graph. 8. Use your answer from [7] to determine values of spring constant,...

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