Newtons law of motion and Friction questions with solutions

Showing 1–10 of 475 questions

• MCQmediumNewtons law of motion and FrictionNewton's Second Law & Applications

  Two masses A and B of masses mₐ and mᵦ are attached vertically by strings and given an upward acceleration. The ratio T₁/T₂ is:

  

  Options

  • Option A

    (mₐ+mᵦ)/mᵦ

  • Option B

    (mₐ+mᵦ)/mₐ

  • Option C

    (mₐ+mᵦ)/(mₐ-mᵦ)

  • Option D

    (mₐ-mᵦ)/(mₐ+mᵦ)

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• MCQmediumNewtons law of motion and FrictionNewton's Second Law & Applications

  The force–time graph shown gives the force F acting on a mass m. Find the change of momentum from t = 0 to 8 s.

  

  Options

  • Option A

    14 N s

  • Option B

    20 N s

  • Option C

    12 N s

  • Option D

    6 N s

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• MCQmediumNewtons law of motion and FrictionPseudo Force & Non-Inertial Frames

  A 2 kg object moves with constant velocity 10î m s⁻¹ and is observed from a frame moving with constant velocity 10î m s⁻¹. The pseudo force on the object in this frame is:

  Options

  • Option A

    0

  • Option B

    20 N along +x

  • Option C

    20 N along -x

  • Option D

    Depends on time

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• MCQeasyNewtons law of motion and FrictionNewton's Law of Motion & Equilibrium

  Two forces having magnitudes A and A/2 are perpendicular to each other. The magnitude of their resultant is:

  Options

  • Option A

    5A/2

  • Option B

    √5 A²/2

  • Option C

    √5 A/4

  • Option D

    √5 A/2

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• Multi-correctdifficultNewtons law of motion and FrictionNewton's Second Law & Applications

  A particle starts from rest on a smooth horizontal floor. A force F=αt acts horizontally. For the two curves shown, which statements are correct?

  

  Select all that apply

  • Option A

    Curve 1 can represent acceleration versus time

  • Option B

    Curve 2 can represent velocity versus time

  • Option C

    Curve 2 can represent velocity versus acceleration

  • Option D

    None

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• MCQmediumNewtons law of motion and FrictionNewton's Second Law & Applications

  A particle of mass 0.3 kg is acted upon by force F=-kx with k=15 N m⁻¹. Its initial acceleration when released 20 cm from origin is:

  Options

  • Option A

    5 m s⁻²

  • Option B

    10 m s⁻²

  • Option C

    3 m s⁻²

  • Option D

    15 m s⁻²

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• MCQdifficultNewtons law of motion and FrictionFriction in Single-Block Systems

  A block of mass m is placed on a plank of mass M lying on a smooth floor. Coefficient of static friction between them is μ. A horizontal force F is applied directly to the upper block. The maximum F for which there is no relative slipping is:

  Options

  • Option A

    μmg

  • Option B

    μ(M+m)g

  • Option C

    μm(M+m)g/M

  • Option D

    μM(M+m)g/m

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• MCQmediumNewtons law of motion and FrictionFriction in Single-Block Systems

  The upper half of an incline of angle φ is smooth and the lower half is rough. A body starts from rest at the top and comes to rest exactly at the bottom. Find the coefficient of friction on the lower half.

  Options

  • Option A

    2 sinφ

  • Option B

    2 cosφ

  • Option C

    2 tanφ

  • Option D

    tanφ

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• MCQdifficultNewtons law of motion and FrictionFriction in Multiple-Block Systems

  A 2 kg block is placed on a 3 kg block. Ground is smooth and coefficient of static friction between blocks is 0.5. A force F is applied on the lower block at 37° below the horizontal. Take g = 10 m/s², sin37° = 3/5 and cos37° = 4/5. Maximum F for which the upper block does not slip is:

  Options

  • Option A

    31.25 N

  • Option B

    40 N

  • Option C

    50 N

  • Option D

    62.5 N

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• MCQmediumNewtons law of motion and FrictionNewton's Second Law & Applications

  A 600 kg rocket fires vertically. The exhaust speed is 1000 m s⁻¹. Find rate of gas ejection required to balance its weight, taking g=10 m s⁻².

  Options

  • Option A

    117.6 kg s⁻¹

  • Option B

    58.6 kg s⁻¹

  • Option C

    6 kg s⁻¹

  • Option D

    76.4 kg s⁻¹

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