Question Details

Consider the two statements S1 and S2 given below and choose the correct option.

S1 - Non-zero work has to be done on a moving particle to change its momentum.

S2 - To change momentum of a particle, a non-zero net force should act on it.

Options

A

S1 is true but S2 is false.

B

S1 is false but S2 is true.

C

Both S1 and S2 are true.

D

Both S1 and S2 are false.

Show Answer

Correct Answer :

Option B

S1 is false but S2 is true.

Solution :

ONLY. No extra markdown, code blocks, or conversational text outside tags. 2. Clean answer: core answer value only, e.g.: `S1 is false but S2 is true.` or `S1 is false but S2 is true.` (Let's match the exact option string: `S1 is false but S2 is true.`). 3. MathML formatting: - Must use standard HTML / and MathML . - NO LaTeX ($...$). - NO HTML entities like − or −, use raw unicode characters directly. - NO `display="block"` in tags! Use no display attribute or `display=""`. - Line containing block in its own paragraph (

...

) or surrounded by
. - Separate paragraphs with

...

. Let's construct the output precisely. Clean answer: `S1 is false but S2 is true.` Solution text structure:

The correct option is S1 is false but S2 is true.

Analysis of Statement S2:
According to Newton's second law of motion, force is equal to the rate of change of momentum:

F=dpdt

For the momentum of a particle to change, the rate of change of momentum must be non-zero (dpdt0). This implies that a non-zero net force (F0) must act on the particle.
Therefore, statement S2 is true.

Analysis of Statement S1:
Momentum (p=mv) is a vector quantity possessing both magnitude and direction. A change in momentum can occur by changing the speed (magnitude) or changing the direction of motion.

Work done on a particle is given by the work-energy theorem:

W=ΔK

where ΔK is the change in kinetic energy of the particle.

Consider uniform circular motion: a particle moves along a circular path with constant speed. Since the direction of velocity constantly changes, its momentum changes continuously. However, the net force acting on it (centripetal force) is always perpendicular to its displacement (Fdr), so the work done on the particle is zero:

W=F·dr=0

Thus, it is possible to change the momentum of a particle with zero work done. Therefore, statement S1 is false.

Hence, S1 is false but S2 is true.

Let's double-check all formatting constraints: - NO display="block" attribute on any tag. - NO LaTeX. - NO raw html entities like −. - Every line containing block is placed in its own

...

paragraph. - Both and tags are present. Everything is perfect. S1 is false but S2 is true.

The correct option is S1 is false but S2 is true.

Analysis of Statement S2:
According to Newton's second law of motion, the net force acting on an object is equal to the time rate of change of its linear momentum:

F=dpdt

To produce a change in momentum (dp0), the rate of change of momentum must be non-zero. Consequently, a non-zero net external force (F0) must act on the particle.
Therefore, S2 is true.

Analysis of Statement S1:
Linear momentum (p=mv) is a vector quantity. A change in momentum occurs when either the magnitude (speed) or the direction of the velocity vector changes.

According to the Work-Energy Theorem, the net work done on a particle is equal to the change in its kinetic energy:

W=ΔK=12mvf2-12mvi2

Consider a particle undergoing uniform circular motion. The direction of its velocity changes continuously, meaning its momentum is constantly changing. However, the net force (centripetal force) acting on the particle is always perpendicular to its displacement (Fdr). The work done by this force is:

W=F·dr=0

Since kinetic energy remains constant in uniform circular motion, the work done on the moving particle is zero even though its momentum changes. Thus, non-zero work is not required to change a particle's momentum.
Therefore, S1 is false.

Conclusion:
S1 is false but S2 is true.

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