رفتار کے تحفظ کا قانون اس بات کی وضاحت کرتا ہے کہ تصادم سے پہلے اور بعد میں دو اجسام کے نظام کی کل رفتار ______؟
A. Losses some momentum
B. Remains constant
C. Retains more momentum
D. None of the above is true
Explanation
The law of conservation of momentum states that the total momentum of a closed system (such as a system of two bodies) remains constant over time, as long as there are no external forces acting on the system.
This means that the total momentum before a collision is equal to the total momentum after the collision.
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تسلسل کے ایس آئی یونٹ کیا ہے؟
A. None of these
B. NS⁻¹
C. Kg m sec⁻¹
D. NS
Explanation
Impulse is defined as the product of force and time ( Impulse = Force × Time ). The SI unit of impulse is Newton-second (NS) , which is equivalent to kg·m/s (momentum unit). Show/Hide Explanation
لکیری رفتار کی تبدیلی کی شرح کو _____ کہا جاتا ہے؟
A. Energy
B. Force
C. None of these
D. Power
Explanation
Force is defined as the rate of change of linear momentum with respect to time.
According to Newton’s second law , force causes a change in an object’s momentum.
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A. None of these
B. 10 N
C. 5 N
D. 15 N
Explanation
Change in momentum = 20 − 5 = 15 kg·m/s
Time = 3 s → Force = 15 / 3 = 5 N
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A. None of these
B. 24%
C. 34%
D. 44%
Explanation
Kinetic energy (K) is related to momentum (p) by K = p² / 2m. If momentum increases by 20%, the new momentum p' = 1.2p.
The new kinetic energy K' = (p')² / 2m = (1.2p)² / 2m = 1.44p² / 2m = 1.44K.
The percentage increase in K.E is ((K' - K) / K) × 100 = ((1.44K - K) / K) × 100 = 44%.
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جسمانی مقدار "تسلسل" میں وہی جہت ہے جو ______ کی طرح ہے؟
A. None of these
B. Power
C. Force
D. Momentum
Explanation
Impulse is defined as Force × Time (F × t) , and its unit is Ns (Newton-second) . Momentum is Mass × Velocity (m × v) , which also has the unit Ns , meaning both have the same dimensions. Show/Hide Explanation
A. Mass
B. None of these
C. Time
D. Volume
Explanation
Momentum is the product of an object’s mass and its velocity → Momentum = Mass × Velocity.
It is a vector quantity .
It is conserved in closed systems during collisions.
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A. 8%
B. 36%
C. 40%
D. None of these
Explanation
Momentum (p) is proportional to velocity (v), while kinetic energy (KE) is proportional to v².
When momentum decreases by 20% , velocity decreases by 20% .
So, kinetic energy decreases by (1 - 0.8²) × 100% ≈ 36%.
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A. 3V/4
B. 4V/3
C. None of these
D. 4V
Explanation
Since the smaller part becomes stationary, it means that the larger part will carry all the momentum.
Let's say the mass of the smaller part is m and the mass of the larger part is 3m.
Initial momentum = Final momentum
mV + 3mV = 3mV'
where V' is the velocity of the larger part.
Combine like terms:
4mV = 3mV'
Divide both sides by 3m:
V' = 4V/3
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کسی دیئے گئے فوری طور پر کسی شے کی رفتار اس کے ______ سے آزاد ہے؟
A. Velocity
B. Mass
C. None of these
D. Acceleration
Explanation
Momentum (p = m v p = mv but not directly on its acceleration. Acceleration affects how momentum changes over time, but at a given instant, momentum is independent of acceleration.
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