Newtons law of motion and Friction questions with solutions

Showing 1–10 of 475 questions

• MCQmediumNewtons law of motion and Frictionnewton second law and problem based on it

  A force applied on a 2 kg mass is represented by F=6î-8ĵ-10k̂ N. The acceleration magnitude is:

  Options

  • Option A

    5√2 m s⁻²

  • Option B

    2√10 m s⁻²

  • Option C

    10 m s⁻²

  • Option D

    20 m s⁻²

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• IntegermediumNewtons law of motion and Frictionfriction and single block problem

  $A_0.5$ kg block is held against a vertical rough wall. The coefficient of static friction is 0.2. Find the minimum horizontal force needed to keep the block at rest. Take g = 10 m s⁻².

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• MCQdifficultNewtons law of motion and Frictionfriction and single block problem

  A 10 kg block rests on a rough horizontal surface with μₛ = 0.5. A force F is applied at 37° above the horizontal. Take g = 10 m/s², sin37° = 3/5 and cos37° = 4/5. The minimum F required to just start the block is:

  Options

  • Option A

    40 N

  • Option B

    45.45 N

  • Option C

    50 N

  • Option D

    62.5 N

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• MCQmediumNewtons law of motion and Frictionsimple pulley problem

  Two masses m₁ and m₂ hang over a frictionless pulley. Their acceleration magnitude is:

  

  Options

  • Option A

    (m₁/m₂)g

  • Option B

    (m₂/m₁)g

  • Option C

    (m₂-m₁)g/(m₁+m₂)

  • Option D

    (m₁+m₂)g/(m₂-m₁)

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• Multi-correctdifficultNewtons law of motion and Frictionnewton second law and problem based on it

  A force of magnitude F=kt is applied at a fixed angle α above horizontal to a block of mass m on a smooth horizontal plane. Which results at the instant it just loses contact with the plane are correct?

  

  Select all that apply

  • Option A

    Time t=mg/(k sinα).

  • Option B

    Speed v=m g² cosα/(2k sin²α).

  • Option C

    Horizontal distance x=m²g³ cosα/(6k² sin³α).

  • Option D

    The normal force is mg at separation.

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• MCQeasyNewtons law of motion and Frictionspring balcnce and weighting

  A lift has mass 2000 kg. The tension in its supporting cable is 28000 N. Find its acceleration (take g=10 m s⁻²).

  Options

  • Option A

    30 m s⁻² downward

  • Option B

    4 m s⁻² upward

  • Option C

    4 m s⁻² downward

  • Option D

    14 m s⁻² upward

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• MCQeasyNewtons law of motion and Frictionnewton second law and problem based on it

  A 500 g body moves along x such that v = 10√x m s⁻¹. The force on the body is:

  Options

  • Option A

    25 N

  • Option B

    5 N

  • Option C

    166 N

  • Option D

    125 N

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• Multi-correctdifficultNewtons law of motion and Frictionconstrain motion and newton second law in constrain motion

  Two men of unequal masses hold the two sides of a light rope over a smooth pulley. Which situations are possible?

  

  Select all that apply

  • Option A

    The lighter man remains stationary while the heavier man slides

  • Option B

    The heavier man remains stationary while the lighter man climbs

  • Option C

    Both men move with same acceleration in same direction

  • Option D

    They move with equal acceleration magnitudes in opposite directions

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• MCQdifficultNewtons law of motion and Frictiontwo and more than two block problem in friction

  A 2 kg block A is placed on a 5 kg block B. The ground is smooth and coefficient of static friction between A and B is 0.4. A horizontal force F is applied on B. Take g = 10 m/s². The maximum value of F for which there is no slipping is:

  Options

  • Option A

    14 N

  • Option B

    20 N

  • Option C

    28 N

  • Option D

    35 N

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• MCQmediumNewtons law of motion and Frictionconstrain motion and newton second law in constrain motion

  A cylinder and a wedge of equal mass m touch each other and move on two smooth fixed inclines making angles α and β with the horizontal. The normal force between cylinder and wedge is:

  

  Options

  • Option A

    mg(sinα cosα+sinβ cosβ)/(cos²α+cos²β)

  • Option B

    mg(sinα+sinβ)/(cosα+cosβ)

  • Option C

    mg cos(α+β)

  • Option D

    mg sin(α+β)

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