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प्रश्न
Give two examples to verify that a force tends to change the static condition of a body.
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उत्तर
Force can change the static condition of a body.
- A rest rubber ball begins to move when a force applied to it.
- The player applies a force on the stationary football while taking a penalty kick in a football match. The force applied by the player makes the football move towards the goal.
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संबंधित प्रश्न
Give one example in the given cases:-
A force changes the size of a body
Which of the following is not the force at a distance:
(a) electrostatic force
(b) gravitational force
(c) frictional force.
(d) magnetic force.
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A lead bullet of mass 20g, travelling with a velocity of 350 ms-1, comes to rest after penetrating 40 cm in a still target. Find:
1) the resistive force offered by the target and
2) the retardation caused by it
A uniform car of mass 500g travels with a uniform velocity of 25 ms-1 for 5 s. The brakes are then applied and the car is uniformly retarded and comes to rest in further 10 s calculate
1) the retardation
2) the distance which the car travels after the brakes are applied
3) The force exerted by the brakes.
Why is it easier to open a door by applying the force at the free end of it?
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?
Define an Inclined plane.
A man can open a nut by applying a force of 150 N by using a lever handle of length 0.4 m. What should be the length of the handle if he is able to open it by applying a force of 60 N?
How do you define force? What are the forces acting on a man standing in a lift? If the lift moves down with an acceleration of 2 ms−2, what is the net force on the man if his mass is 50 kg?
