Rigid Body Dynamics

Description: This quiz will test your knowledge on Rigid Body Dynamics.
Number of Questions: 14
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Tags: physics mechanics rigid body dynamics
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What is the moment of inertia of a thin rod of mass (m) and length (L) about an axis perpendicular to the rod and passing through one end?

  1. (\frac{1}{3}mL^2)

  2. (\frac{1}{2}mL^2)

  3. (mL^2)

  4. (2mL^2)


Correct Option: A
Explanation:

The moment of inertia of a thin rod about an axis perpendicular to the rod and passing through one end is given by (\frac{1}{3}mL^2).

What is the angular momentum of a rigid body rotating about a fixed axis with angular velocity (\omega) and moment of inertia (I)?

  1. (I\omega)

  2. (\frac{1}{2}I\omega^2)

  3. (2I\omega)

  4. (\frac{1}{2}I\omega)


Correct Option: A
Explanation:

The angular momentum of a rigid body rotating about a fixed axis is given by (I\omega).

What is the kinetic energy of a rigid body rotating about a fixed axis with angular velocity (\omega) and moment of inertia (I)?

  1. (\frac{1}{2}I\omega^2)

  2. (I\omega)

  3. (2I\omega^2)

  4. (\frac{1}{2}I\omega)


Correct Option: A
Explanation:

The kinetic energy of a rigid body rotating about a fixed axis is given by (\frac{1}{2}I\omega^2).

What is the torque acting on a rigid body rotating about a fixed axis with angular acceleration (\alpha) and moment of inertia (I)?

  1. (I\alpha)

  2. (\frac{1}{2}I\alpha^2)

  3. (2I\alpha)

  4. (\frac{1}{2}I\alpha)


Correct Option: A
Explanation:

The torque acting on a rigid body rotating about a fixed axis is given by (I\alpha).

What is the equation of motion for a rigid body rotating about a fixed axis?

  1. (I\alpha = \sum\tau)

  2. (\frac{1}{2}I\alpha^2 = \sum\tau)

  3. (2I\alpha = \sum\tau)

  4. (\frac{1}{2}I\alpha = \sum\tau)


Correct Option: A
Explanation:

The equation of motion for a rigid body rotating about a fixed axis is (I\alpha = \sum\tau).

What is the moment of inertia of a uniform disk of mass (m) and radius (R) about an axis perpendicular to the disk and passing through its center?

  1. (\frac{1}{2}mR^2)

  2. (mR^2)

  3. (2mR^2)

  4. (\frac{1}{4}mR^2)


Correct Option: A
Explanation:

The moment of inertia of a uniform disk about an axis perpendicular to the disk and passing through its center is given by (\frac{1}{2}mR^2).

What is the moment of inertia of a uniform sphere of mass (m) and radius (R) about an axis passing through its center?

  1. (\frac{2}{5}mR^2)

  2. (\frac{3}{5}mR^2)

  3. (\frac{4}{5}mR^2)

  4. (\frac{1}{5}mR^2)


Correct Option: A
Explanation:

The moment of inertia of a uniform sphere about an axis passing through its center is given by (\frac{2}{5}mR^2).

What is the angular velocity of a rigid body rotating about a fixed axis with constant angular acceleration (\alpha) and initial angular velocity (\omega_0) after time (t)?

  1. (\omega_0 + \alpha t)

  2. (\omega_0 - \alpha t)

  3. (2\omega_0 + \alpha t)

  4. (\frac{1}{2}\omega_0 + \alpha t)


Correct Option: A
Explanation:

The angular velocity of a rigid body rotating about a fixed axis with constant angular acceleration (\alpha) and initial angular velocity (\omega_0) after time (t) is given by (\omega_0 + \alpha t).

What is the angular displacement of a rigid body rotating about a fixed axis with constant angular acceleration (\alpha) and initial angular velocity (\omega_0) after time (t)?

  1. (\omega_0 t + \frac{1}{2}\alpha t^2)

  2. (\omega_0 t - \frac{1}{2}\alpha t^2)

  3. (2\omega_0 t + \alpha t^2)

  4. (\frac{1}{2}\omega_0 t + \alpha t^2)


Correct Option: A
Explanation:

The angular displacement of a rigid body rotating about a fixed axis with constant angular acceleration (\alpha) and initial angular velocity (\omega_0) after time (t) is given by (\omega_0 t + \frac{1}{2}\alpha t^2).

What is the relationship between the linear velocity (v) of a point on a rigid body rotating about a fixed axis and the angular velocity (\omega) of the body?

  1. (v = \omega r)

  2. (v = \frac{1}{2}\omega r)

  3. (v = 2\omega r)

  4. (v = \frac{1}{4}\omega r)


Correct Option: A
Explanation:

The relationship between the linear velocity (v) of a point on a rigid body rotating about a fixed axis and the angular velocity (\omega) of the body is given by (v = \omega r), where (r) is the distance from the point to the axis of rotation.

What is the relationship between the centripetal acceleration (a_c) of a point on a rigid body rotating about a fixed axis and the angular velocity (\omega) of the body?

  1. (a_c = \omega^2 r)

  2. (a_c = \frac{1}{2}\omega^2 r)

  3. (a_c = 2\omega^2 r)

  4. (a_c = \frac{1}{4}\omega^2 r)


Correct Option: A
Explanation:

The relationship between the centripetal acceleration (a_c) of a point on a rigid body rotating about a fixed axis and the angular velocity (\omega) of the body is given by (a_c = \omega^2 r), where (r) is the distance from the point to the axis of rotation.

What is the moment of inertia of a uniform cylinder of mass (m) and radius (R) about an axis parallel to the cylinder's axis and passing through its center?

  1. (\frac{1}{2}mR^2)

  2. (mR^2)

  3. (2mR^2)

  4. (\frac{1}{4}mR^2)


Correct Option: A
Explanation:

The moment of inertia of a uniform cylinder about an axis parallel to the cylinder's axis and passing through its center is given by (\frac{1}{2}mR^2).

What is the moment of inertia of a uniform rectangular plate of mass (m), width (w), and height (h) about an axis perpendicular to the plate and passing through its center?

  1. (\frac{1}{12}m(w^2 + h^2))

  2. (\frac{1}{2}m(w^2 + h^2))

  3. (m(w^2 + h^2))

  4. (2m(w^2 + h^2))


Correct Option: A
Explanation:

The moment of inertia of a uniform rectangular plate about an axis perpendicular to the plate and passing through its center is given by (\frac{1}{12}m(w^2 + h^2)).

What is the moment of inertia of a uniform triangular plate of mass (m), base (b), and height (h) about an axis perpendicular to the plate and passing through its vertex?

  1. (\frac{1}{12}mb^2)

  2. (\frac{1}{2}mb^2)

  3. (mb^2)

  4. (2mb^2)


Correct Option: A
Explanation:

The moment of inertia of a uniform triangular plate about an axis perpendicular to the plate and passing through its vertex is given by (\frac{1}{12}mb^2).

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