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JEE Main Laws of Motion — practice questions — page 3

Explore 67 free Laws of Motion questions in JEE Main Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Laws of Motion questions and exercises with answers

Showing questions 61–67 of 67.

Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every statement the first law licensesRead the answer and worked solution →Flip and pair: name with contributionRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the historical argumentRead the answer and worked solution →

Worked practice questions

Assertion and reason

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Questions
  1. Reason
    With little friction, there is almost no external force to slow it.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A puck slides a long way on smooth ice with no push.
  2. Reason
    Both say a body's motion persists unless an external force acts.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Newton's first law is a restatement of Galileo's law of inertia.
  3. Reason
    Friction opposes motion in everyday situations.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    A force is required to maintain uniform motion.
The reason must genuinely explain the assertion. Source: syllabus Physics, Ch 4 Laws of Motion.

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Two are true, one is not

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Questions
  1. False statement
    Force is needed to maintain uniform motion
    Statements
    1. Zero net force means zero acceleration
    2. Friction opposes motion
    3. Force is needed to maintain uniform motion
  2. False statement
    Momentum is mass times acceleration
    Statements
    1. Momentum is mass times acceleration
    2. Momentum is mass times velocity
    3. The second law concerns rate of change of momentum
  3. False statement
    Aristotle discovered the law of inertia
    Statements
    1. Galileo used inclined planes
    2. Aristotle discovered the law of inertia
    3. Newton restated the law of inertia
The false line reinstates the Aristotelian error. Source: syllabus Physics, Ch 4 Laws of Motion.

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Three of these are wrong. Find the one that holds.

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Questions
  1. Question
    Three of these statements about the first law are false.
    Choices
    1. Item
      Zero net force means zero acceleration
      Correct
      Yes
    2. Explanation
      The chapter says this Aristotelian view is wrong.
      Item
      Force is needed to keep moving
    3. Explanation
      It covers uniform motion in a straight line too.
      Item
      It applies only to bodies at rest
    4. Explanation
      That is the definition of momentum, not the first law.
      Item
      It defines momentum as mass times velocity
Each trap restores a pre-Galilean belief. Source: syllabus Physics, Ch 4 Laws of Motion.

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