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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
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
  • ✓
    All of these
✓

Answer

Correct option: D.
All of these
d
(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

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