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NEET UG System of Particles and Rotational Motion — practice questions — page 5

Explore 139 free System of Particles and Rotational Motion questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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System of Particles and Rotational Motion questions and exercises with answers

Showing questions 121–139 of 139.

Two opposite 5 N forces form a couple with lines of action 0.4 m apart. The couple's moment isRead the answer and worked solution →How many independent conditions must hold for general mechanical equilibrium of a rigid body?Read the answer and worked solution →If all forces on a rigid body are coplanar, equilibrium needs how many conditions?Read the answer and worked solution →For a particle, rather than an extended body, equilibrium only requires thatRead the answer and worked solution →A lever lifts a 200 N load with a 0.5 m load arm. The effort arm is 2 m. What effort is needed?Read the answer and worked solution →A lever has effort arm 2 m and load arm 0.5 m. What is its mechanical advantage?Read the answer and worked solution →A lever has mechanical advantage greater than one whenRead the answer and worked solution →On a lever, the point about which it pivots is called theRead the answer and worked solution →The centre of gravity of a body coincides with its centre of mass whenRead the answer and worked solution →How is the CG of an irregular sheet found by hanging it?Read the answer and worked solution →The position of the centre of mass of a body depends onRead the answer and worked solution →A rigid body fixed at one point or along a line can haveRead the answer and worked solution →The total torque on a system does not depend on the chosen origin when the total externalRead the answer and worked solution →Two small masses m are fixed at the ends of a light rod of length l. I about a perpendicular axis through its centre?Read the answer and worked solution →Moment of inertia about an axis equals the ratio of the applied torque to the resultingRead the answer and worked solution →The moment of inertia of a composite rigid system about an axis isRead the answer and worked solution →A wheel turns through angle Δθ in time Δt. Its average angular velocity isRead the answer and worked solution →Moment of force and angular momentum are both defined asRead the answer and worked solution →Which property is shared by both the scalar and the vector product?Read the answer and worked solution →

Worked practice questions

Two opposite 5 N forces form a couple with lines of action 0.4 m apart. The couple's moment is

  1. 4 N m
  2. 1 N m
  3. 12.5 N m
  4. 2 N m
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Correct answer: D. 2 N m

Moment of a couple = F x separation = 5 x 0.4 = 2 N m, the same about any point.

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How many independent conditions must hold for general mechanical equilibrium of a rigid body?

  1. Three
  2. Two
  3. Four
  4. Six
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Correct answer: D. Six

Three force components and three torque components must each vanish, giving six conditions.

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If all forces on a rigid body are coplanar, equilibrium needs how many conditions?

  1. One
  2. Two
  3. Three
  4. Six
Show answer and solution

Correct answer: C. Three

Two force sums along perpendicular axes in the plane and one torque sum about a perpendicular axis must be zero.

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