Physics Chapter on Rotational Motion
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Questions and Answers

Why are door knobs installed at the opposite side of the hinge?

To make it as easy as possible to open the door by maximizing the lever arm.

What is angular acceleration?

Rate of change of angular velocity.

1 revolution = ____° = ____ radians

360°, 2π

What is moment of inertia?

<p>Rotational analog for mass; property of a rotating body to resist change in its state of rotation.</p> Signup and view all the answers

Which of the following units is used for angular velocity?

<p>All of the above (D)</p> Signup and view all the answers

What does torque measure?

<p>Effectiveness of a force in rotating a body.</p> Signup and view all the answers

According to Newton's 1st Law, what will happen to a body at rest?

<p>It will remain at rest. (B)</p> Signup and view all the answers

What is the SI unit of torque?

<p>meter-newton (m·N)</p> Signup and view all the answers

What occurs when net torque acting on an object is zero?

<p>Rotational equilibrium</p> Signup and view all the answers

What does rotational dynamics involve?

<p>The relationship between torque, angular acceleration, and moment of inertia</p> Signup and view all the answers

What is gravity?

<p>A fundamental force of attraction between masses</p> Signup and view all the answers

Define periodic motion.

<p>Repeated oscillations or cycles</p> Signup and view all the answers

What are mechanical waves?

<p>Waves that involve the transfer of energy through a medium</p> Signup and view all the answers

What kind of wave is sound?

<p>A mechanical wave</p> Signup and view all the answers

What does fluid mechanics study?

<p>The behavior of fluids (liquids and gases)</p> Signup and view all the answers

What is temperature a measure of?

<p>The average kinetic energy of particles in a substance</p> Signup and view all the answers

What is heat?

<p>The transfer of thermal energy from a hotter object to a cooler one</p> Signup and view all the answers

What do ideal gases follow?

<p>Specific laws describing their behavior under different conditions</p> Signup and view all the answers

What do the laws of thermodynamics describe?

<p>The relationships between heat, work, and internal energy in thermodynamic systems</p> Signup and view all the answers

Flashcards

Angular Displacement

The angle (in radians, degrees, or revolutions) through which a point revolves around a center.

Angular Velocity

The rate of change of angular displacement with time.

Angular Acceleration

The rate of change of angular velocity.

Moment of Inertia

A body's resistance to changes in its rotational motion.

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Torque

The effectiveness of a force in causing rotation.

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Lever Arm

The perpendicular distance from the pivot point to the line of action of the force.

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Newton's 1st Law (Rotation)

A body at rest will stay at rest and a rotating body will keep rotating at constant velocity unless acted upon by an unbalanced torque.

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Newton's 2nd Law (Rotation)

An unbalanced torque causes angular acceleration. The angular acceleration is proportional to the torque and inversely proportional to the moment of inertia.

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Radius of Gyration

A measure of how the mass of a body is distributed from the axis of rotation.

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Rotational Kinematics

Describes rotational motion without considering the causes.

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Rotational Equilibrium

When the net torque on an object is zero, causing no rotational acceleration

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Gravity

A fundamental force of attraction between masses

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Fluid Mechanics

The study of how liquids and gases behave

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Ideal Gases

Gases that follow specific physical laws

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Periodic Motion

Repeated oscillation or cycling movement

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Study Notes

Door Knob Placement

  • Door knobs are installed on the opposite side of the hinge to maximize leverage and ease of operation.
  • This placement allows for a more comfortable grip and efficient turning motion, as the force is applied perpendicular to the door, resulting in a larger torque.

Angular Acceleration

  • It is the rate of change of angular velocity over time.
  • It is measured in radians per second squared (rad/s²).

Revolution, Degrees and Radians

  • One revolution is equivalent to 360 degrees.
  • One revolution is also equivalent to 2Ï€ radians.

Moment of Inertia

  • It is a measure of an object's resistance to rotational motion.
  • It depends on the object's mass distribution and the axis of rotation.

Units for Angular Velocity

  • The SI unit for angular velocity is radians per second (rad/s).
  • Alternatively, it can also be measured in revolutions per minute (rpm).

Torque Measurement

  • Torque measures the tendency of a force to rotate an object around an axis.
  • It is calculated by multiplying the force and the perpendicular distance from the axis of rotation to the line of action of the force.

Newton's 1st Law

  • According to Newton’s 1st Law of motion, a body at rest will remain at rest, or a body in motion will remain in motion at a constant velocity unless acted upon by a net external force.

SI Unit of Torque

  • The SI unit of torque is the newton-meter (N·m).

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Related Documents

GenPhys (Finals) (1).pdf

Description

Test your understanding of key concepts in rotational motion, including moment of inertia, angular velocity, and torque. This quiz covers fundamental questions related to mechanics, ensuring you grasp the principles governing rotational dynamics.

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