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The Special Theory of Relativity — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsThe Special Theory of Relativity1 Mark
Question
If a constant force acts on a particle, its acceleration will:
  1. Remain constant.
  2. Gradually decrease.
  3. Gradually increase.
  4. Be undefined.
✓

Answer

  1. Gradually decrease.

Explanation:

If a constant force is acting on a particle, the force will tend to accelerate the particle and increase its speed. But, due to increase in speed, the mass of the particle will increase by the relation $\text{m}=\frac{\text{m}_0}{\sqrt{1-\frac{\text{v}^2}{\text{c}^2}}}$

leading to decrease in acceleration as constant force is acting. Therefore, after sometime its acceleration will start decreasing gradually.

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