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Define torque and mention its unit.

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प्रश्न

Define torque and mention its unit.

व्याख्या
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उत्तर

Torque is defined as the moment of the externally applied force about a point or axis of rotation. The expression for torque is, `vectau = vecr xx vecF`.

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पाठ 5: Motion of System of Particles and Rigid Bodies - Evaluation [पृष्ठ २६२]

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सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 11 TN Board
पाठ 5 Motion of System of Particles and Rigid Bodies
Evaluation | Q II. 3. | पृष्ठ २६२

संबंधित प्रश्‍न

A solid cylinder of mass 20 kg rotates about its axis with angular speed 100 rad s–1. The radius of the cylinder is 0.25 m. What is the kinetic energy associated with the rotation of the cylinder? What is the magnitude of the angular momentum of the cylinder about its axis?


Explain why friction is necessary to make the disc in Figure roll in the direction indicated

(a) Give the direction of frictional force at B, and the sense of frictional torque, before perfect rolling begins.

(b) What is the force of friction after perfect rolling begins?


A rectangular brick is kept on a table with a part of its length projecting out. It remains at rest if the length projected is slightly less than half the total length but it falls down if the length projected is slightly more than half the total length. Give reason.


A ladder is resting with one end on a vertical wall and the other end on a horizontal floor. If it more likely to slip when a man stands near the bottom or near the top?


Two discs of the same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of the disc with angular velocities ω1 and ω2. They are brought in to contact face to face coinciding with the axis of rotation. The expression for loss of energy during this process is, ______


The ratio of the acceleration for a solid sphere (mass m and radius R) rolling down an incline of angle θ without slipping and slipping down the incline without rolling is, ______


Choose the correct alternatives:

  1. For a general rotational motion, angular momentum L and angular velocity ω need not be parallel.
  2. For a rotational motion about a fixed axis, angular momentum L and angular velocity ω are always parallel.
  3. For a general translational motion , momentum p and velocity v are always parallel.
  4. For a general translational motion, acceleration a and velocity v are always parallel.

The net external torque on a system of particles about an axis is zero. Which of the following are compatible with it?

  1. The forces may be acting radially from a point on the axis.
  2. The forces may be acting on the axis of rotation.
  3. The forces may be acting parallel to the axis of rotation.
  4. The torque caused by some forces may be equal and opposite to that caused by other forces.

Two discs of moments of inertia I1 and I2 about their respective axes (normal to the disc and passing through the centre), and rotating with angular speed ω2 and ω2 are brought into contact face to face with their axes of rotation coincident.

  1. Does the law of conservation of angular momentum apply to the situation? why?
  2. Find the angular speed of the two-disc system.
  3. Calculate the loss in kinetic energy of the system in the process.
  4. Account for this loss.

A particle of mass ‘m’ is moving in time ‘t’ on a trajectory given by

`vecr  = 10alphat^2hati + 5beta(t - 5)hatj`

Where α and β are dimensional constants.

The angular momentum of the particle becomes the same as it was for t = 0 at time t = ______ seconds.


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