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4-1.Newton's Laws of Motion
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From Newton's second law of motion, it can be inferred that
A
No force is required to move a body uniformly along straight line
B
Accelerated motion is always due to an external force
C
Inertial mass of a body is equal to force required per unit acceleration in the body
D
All of these
Solution
(d)
By Newton's second law
$\vec{F}=m \vec{a}$
for $(1)$ Uniform motion means body is moving with constant velocity. By $(i)$ it can be said that only for accelerated motion force is required
$(2)$ is true using $(i)$
$(3)$ Using $(i)$ $\vec{a}=\frac{\vec{F}}{m}$ so this is true
Standard 11
Physics
