Q3 of 13 Page 128

Answer the following

Describe the mode of energy transformation in a mechanical and quartz clock.

In a mechanical clock potential energy changes into kinetic energy. When the spring is revolved it stores potential energy and when it is released it changes into kinetic energy.


In a quartz clock, electrical energy changes into magnetic energy and then into kinetic energy.


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3

Answer the following

A bus and a car are moving at the same speed. Which of the two has a greater kinetic energy?

 3

Answer the following

A ball of mass 200g falls from a height of 5m. What is its kinetic energy when it just reaches the ground?(g = 9.8 ms-2)

 3

Answer the following

There are a number of devices in common use that change energy from one form to another. Name some devices that change


1. electrical energy into light energy


2. electrical energy into mechanical energy


3. electrical energy into heat


4. sound energy into electrical energy


5. chemical energy into electrical energy.

 3

Answer the following

What kind of energy transformation takes place at the thermal power station?