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Is equation overset(rarr)f = ma valid in...

Is equation `overset(rarr)f = ma` valid in each and every case ? Why ?

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No. in equation `vec( F ) = m vec( a) = (m(d vec( v)))/( dt )` we have consider mass as constant .But according to theory of relative mass may changes .
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KUMAR PRAKASHAN-LAW OF MOTION-SECTION-C(OBJECTIVE QUESTIONS) (VSQS)
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  2. For a vehicle moving on a banked curved road, using free body diagram ...

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  3. What is level of wear and tear for vehicle moving on banked curved roa...

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  4. Write condition that vehicle can be parked on circular road with slope...

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  5. If vehicle is moving on banked curved road and v lt v(0), then what wi...

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  6. Which component of force provide centripetal force to vehicle moving w...

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  7. Why isolated (single) force does not exist in nature ?

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  8. Can we get out of smooth surface by taking jump on it ?

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  9. “When a person walk on rough surface then frictional force act in oppo...

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  10. Radius of level circular track is 20 m. If co­efficient of friction is...

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  11. Area enclosed by Frarr t graph for given body in 1 sec. interval is 10...

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  12. A vehicle of 100 kg is moving with velocity of 5 m/s. How much force w...

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  13. Is equation overset(rarr)f = ma valid in each and every case ? Why ?

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  14. A ball of mass 0.2 kg is thrown in the vertical direction with a veloc...

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  15. What is similar from the dynamics point of view between a book lying s...

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  16. F rarr t graph for a body is shown in the . What is the change in the ...

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  17. Give dimensional formula of impulse of force.

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  18. As per Bohr model, the minimum energy (in eV) required to remove an el...

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  19. In uniform circular motion (i) only the value of velocity is constan...

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  20. Which out of (i) value of velocity, (ii) value of acceleration, ...

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