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Laws of Motion
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Newton's Second Law of Motion
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A certain particle undergoe...
Question
A certain particle undergoes erratic motion. At every point in its motion, the direction of the particle's momentum is always
A
the same as the direction of its velocity
B
the same as the direction of its acceleration
C
the same as the direction of its net force
D
the same as the direction of its kinetic energy
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Solution
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Correct option is
A
the same as the direction of its velocity
Linear momentum (
$P$
) of a body of mass m and velocity
$v$
is expressed as:
$P=mv$
.
Since,
$P$
is a vector quantity and its direction is defined by the direction of
$v$
, it always has the same direction as
$v$
.
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