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प्रश्न
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
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उत्तर
- Yes, there can be displacement in an object in the absence of force. If the object is moving at a uniform speed, then no external force acts on that object, but there is displacement in the object.
- When an object is released in a free state from an inclined plane, it comes down due to the force of gravity, but on reaching the earth's surface, no force acts on it in the horizontal direction.
- That object moves at a uniform speed in the horizontal direction, and displacement keeps occurring in it.
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संबंधित प्रश्न
When do we say that work is done?
Define 1 J of work.
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
Is power a scalar or a vector quantity?
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
