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प्रश्न
Tick the most appropriate answer.
The force applied on a machine to do work is called the
विकल्प
load
effort
efficiency
fulcrum
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उत्तर
effort
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संबंधित प्रश्न
Write true or false of the following statement.
Potential energy changes into kinetic energy when it is put to use
Fill in the blank
Cooking gas converts _______ energy into heat energy.
Select the correct alternatives
When a bulb lights up on passing current, the change of energy is
Answer the following in short.
What do you understand by the term efficiency of a machine’?
Name two units of power bigger than watt.
Define the term 'watt'.
What is the common name of '1 kWh' of electrical energy?
- Take two aluminium channels of different lengths.
- Place the lower ends of the channels on the floor and hold their upper ends at the same height.
- Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.
- At the moment of releasing the balls, which energy do the balls have?
- As the balls roll down which energy is converted into which other form of energy?
- Why do the balls cover the same distance on rolling down?
Note: The question is wrong. It should be "Why do the balls cover the same distance after rolling down"? - What is the form of the eventual total energy of the balls?
- Which law related to energy does the above activity demonstrate? Explain.
We make useful objects from a variety of substances. Another use of substances is that we get energy from some of them.
When we have run a long distance, we feel tired. We have to stop. Why is that?
Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.
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