Physics
Define force. State its S.I. unit.
Force
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Answer
Force is that cause which changes the state of the body (either the state of rest or the state of motion) or changes the size or shape of the body. The S.I. unit of force is newton (N).
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Related Questions
Write true or false for each statement:
(a) The S.I. unit of force is kgf.
(b) A force always produces both the linear and turning motions.
(c) Moment of force = force x perpendicular distance of force from the pivoted point.
(d) Less force is needed when applied at a farther distance from the pivoted point.
(e) For a given thrust, pressure is more on a surface of large area.
(f) The pressure on a surface increases with an increase in the thrust on the surface.
(g) A man exerts same pressure on the ground whether he is standing or he is lying.
(h) It is easier to hammer a blunt nail into a piece of wood than a sharply pointed nail.
(i) The S.I. unit of pressure is pascal.
(j) Water in a lake exerts pressure only at its bottom.
(k) A liquid exerts pressure in all directions.
(l) Gases exert pressure in all directions.
(m) The atmospheric pressure is nearly 105 Pa.
(n) Higher we go, greater is the air pressure.
Match the following:
Column A Column B (a) Camel (i) broad and deep foundation (b) Truck (ii) broad feet (c) Knife (iii) six or eight tyres (d) High building (iv) sharp cutting edge (e) Thrust (v) atm (f) Moment of force (vi) N (g) Atmospheric pressure (vii) N m State two effects of a force when applied on a body.
How does the effect of a force differ when it is applied on
(a) a rigid body
(b) a non-rigid body?