Effects of Force
i)
Force
can change the state of rest or the state of motion.
a)
Force
can move a rigid stationary body which is free to move in the direction of
force applied.
b)
A
moving body can be stopped by applying a force in the opposite direction of its
motion.
c)
The
speed of a moving body increases when a force is applied in the direction of
its motion.
d)
The
direction of a body can be changed by a force applied perpendicular to the direction
of the motion.
e)
If
a force is applied in any other direction then both the direction and speed of
the body will change.
ii)
If
a force is applied on a non-rigid body which is not free to move, it changes
the shape or size of the body.
Units of Force:
C.G.S unit 1 dyne = gm cm s-2
dyne: One dyne is that force which when acts on a body of mass
1gm, produces an acceleration of 1cm/s2
in it.
S.I unit I newton
= kg m s-2
newton: One newton is that force which when acts on a body of mass
1kg, produces an acceleration of kg/s2.
1N = 105 dynes
Gravitational unit of force F = mg
M.K.S unit 9.8N =
1kgf
C.G.S unit 980
dynes = 1gf
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