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How does the wave pattern of a loud note differ from that of a soft note? Draw a diagram.
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The temperature at which a solid convert into a liquid is called its .........
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Molecules of a substance are always in a state of............ and so they possess .............
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Differentiate between melting point ,giving atleast one example of each.
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Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.
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Some ice is taken in a beaker and its temperature is recorded after each one minute. The observations are listed below
| Time (in minute) | Temperature (in °C) |
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 3.8 |
| 7 | 7.6 |
| 8 | 11.4 |
From the above observations, what conclusion do you draw about the melting point of ice?
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What determines the pitch of a sound?
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Draw a diagram to show the wave pattern of high pitch note and a low pitch note, but of the same loudness.
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The energy of a flying kite is kinetic energy.
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Kinetic energy = 1/2 × mass × ............
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When a boy doubles his speed, his kinetic energy becomes
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Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
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State two factors on which the kinetic energy of a moving body depends.
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Two toy-cars A and Bof masses 200 g and 500 g respectively are moving with the same speed. Which of the two has greater kinetic energy?
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A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same?
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Write the expression for the kinetic energy of a body explaining the meaning of the symbols used.
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A ball of mass M is moving with a speed v. What is its kinetic energy?
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