Newton's Second Law & Applications questions with solutions

Showing 1–10 of 127 questions

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

  Two particles start together from point O and slide down two smooth straight inclines lying in the same vertical plane, one making 30° and the other 60° with the vertical. The relative acceleration of the second with respect to the first is:

  

  Options

  • Option A

    g/2 vertically

  • Option B

    g√3/2 at 45° with vertical

  • Option C

    g/√3 at 60° with vertical

  • Option D

    g vertically

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

  A 5 kg block on a rough horizontal floor (μ=0.2) is pushed by a force 20 N at 45° downward toward the surface, as shown. Find speed after 15 s from rest (g=10 m s⁻²).

  

  Options

  • Option A

    3.936 m s⁻¹

  • Option B

    6.396 m s⁻¹

  • Option C

    9.369 m s⁻¹

  • Option D

    3.215 m s⁻¹

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

  Three touching blocks A, B and C have masses 4 kg, 2 kg and 1 kg on a frictionless floor. A horizontal force 14 N pushes block A. Find contact force between A and B.

  

  Options

  • Option A

    2 N

  • Option B

    6 N

  • Option C

    8 N

  • Option D

    18 N

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

  Five persons A,B,C,D,E pull a 100 kg cart. With all five, acceleration is 3 m s⁻² east. If A stops, acceleration is 1 m s⁻² west. If only B stops, acceleration is 24 m s⁻² north. What is the cart acceleration when only A and B pull in their original directions?

  Options

  • Option A

    26 m s⁻²

  • Option B

    3√71 m s⁻²

  • Option C

    25 m s⁻²

  • Option D

    30 m s⁻²

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

  A body of mass M hits a rigid wall normally with speed v and rebounds with the same speed. Find the magnitude of impulse experienced.

  Options

  • Option A

    2Mv

  • Option B

    1.5Mv

  • Option C

    zero

  • Option D

    Mv

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

  A 3 kg body strikes a smooth wall at an angle of 60° with the wall and rebounds at the same angle with speed 10 m s⁻¹. Impact time is 0.2 s. Find average force on the wall.

  

  Options

  • Option A

    150√3 N

  • Option B

    50√3 N

  • Option C

    100 N

  • Option D

    75√3 N

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

  Two forces of equal magnitude F have a resultant of the same magnitude F. The angle between the forces is:

  Options

  • Option A

    45°

  • Option B

    120°

  • Option C

    150°

  • Option D

    60°

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

  A block B is pushed along a rough horizontal surface with initial speed v. With kinetic friction coefficient μ and gravity g, find time to stop.

  

  Options

  • Option A

    μg/v

  • Option B

    v/(μg)

  • Option C

    v/g

  • Option D

    v/(2μg)

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

  Forces 6 N rightward and 3 N leftward act on 2 kg and 1 kg blocks in contact on a frictionless floor as shown. The force exerted on the 2 kg block by the 1 kg block is:

  

  Options

  • Option A

    1 N

  • Option B

    2 N

  • Option C

    4 N

  • Option D

    5 N

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

  A small ball of mass m is thrown vertically upward with speed u. The resistive force has magnitude mkv². The maximum height attained is:

  Options

  • Option A

    (1/2k)tan⁻¹(ku²/g)

  • Option B

    (1/k)ln(1+ku²/2g)

  • Option C

    (1/2k)ln(1+ku²/g)

  • Option D

    (1/k)tan⁻¹(ku²/2g)

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