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प्रश्न
Which one of the following forces is a contact force?
विकल्प
Force of gravity
Force of friction
Magnetic force
Electrostatic force
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उत्तर
Force of friction
Explanation:
Force of friction is a contact force. It always acts when the bodies are in contact.
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संबंधित प्रश्न
An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gap in the following statement using the following terms.
The type of force responsible for a change in the state of motion of the arrow is an example of a ______ force.
Match the following:
| Group ‘A’ | Group ‘B’ | ||
| (i) | An ox pulling a cart | (a) | Magnetic force |
| (ii) | Lifting a heavy iron object with a crane | (b) | Electrostatic force |
| (iii) | Weighing with a spring balance | (c) | Muscular force |
| (iv) | Applying brakes to a bicycle | (d) | Gravitational force |
| (v) | Picking up pieces of paper with a plastic scale | (e) | Frictional force |
One or more forces are acting in the following example. Name them.
Winnowing foodgrain: ______
Explain in your own words and give one example.
Muscular force
Explain in your own words and give one example.
Electrostatic force
Why machines are oiled from time to time?
In what way are we different muscular force and mechanical force?
Solve the following crossword puzzle.
Down:
(1) _______ force is to be applied to push a scooter that has failed.
(2) _________ force can be used to pick up scattered pins.
Across:
(1) A _______ pulls an iron nail towards itself.
(3) ________ force was used when the farm was ploughed with a tractor.
(4) It is due to the force of _________ that raindrops fall to the ground.
Force executed by touching the body is called non–contact force.
Gravity pushes the ripen coconut from the tree to the ground.
