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प्रश्न
Give two examples each of contact and non-contact forces.
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उत्तर
Contact Forces:
(i) Pushing a pile of rubble by a bulldozer.
(ii) Squeezing of a gum tube to extract the gum.
Non-contact Forces:
(i) When a magnet is brought near iron-nails, they stick to the magnet.
(ii) A ripen apple falls by itself from the tree.
संबंधित प्रश्न
Give one example in the given cases:-
A force changes the shape of a body
Define Newton (the S.I unit of force)
Which of the following is not the force at a distance:
(a) electrostatic force
(b) gravitational force
(c) frictional force.
(d) magnetic force.
The adjacent diagram shows a heavy roller, with its axle at O, which is to be raised on a pavement XY. If there is friction between the roller and pavement, show by an arrow on the diagram the point of application and the direction of force to be applied. If pivoted at O, now will it go up?
The force of friction always acts ______ the motion.
Fill in the empty spaces
Can you give example for contact and non-contact forces?
Give two examples to verify that a force changes the shape of a body.
Turning a nut with a spanner having a short handle is so easy than one with a long handle.
Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other, who catches it, How will this activity affect the position of the two? Explain your answer.
The moon attracts Earth with a force of 1020 N, and then the force with which the Earth attracts the moon is ______.
