All Flashcards
What is the difference between linear and angular velocity?
Linear velocity: Describes the rate of change of an object's position in a straight line. Angular velocity: Describes the rate of change of an object's angular position during rotation.
How does linear inertia differ from rotational inertia?
Linear inertia (mass): Resistance to changes in linear motion, depends only on mass. Rotational inertia: Resistance to changes in rotational motion, depends on mass and its distribution relative to the axis of rotation.
Compare linear and angular acceleration.
Linear acceleration: The rate of change of linear velocity. Angular acceleration: The rate of change of angular velocity.
Compare force and torque.
Force: A push or pull that causes linear acceleration. Torque: A twisting force that causes angular acceleration.
What is the difference between linear momentum and angular momentum?
Linear momentum: Mass in motion in a straight line. Angular momentum: Rotational inertia in motion.
What is the effect of applying a net torque to an object?
The object experiences angular acceleration.
What happens if the net torque acting on an object is zero?
The object's angular velocity remains constant (no angular acceleration).
What happens if you double the net torque applied to a rigid system?
The angular acceleration of the system doubles.
What is the effect of doubling the rotational inertia of a rigid system, given a constant net torque?
The angular acceleration of the system is halved.
What happens when a force is applied farther from the hinge of a door?
The torque applied to the door increases, resulting in a greater angular acceleration.
How do you calculate net torque?
Add up all the individual torques acting on the object as vectors.
How do you calculate rotational inertia for a system of point masses?
Use the formula: , where m is the mass of each point and r is its distance from the axis of rotation.
How do you relate linear and angular speed for rolling without slipping?
The linear speed of the center of mass is related to the angular speed by , where R is the radius of the object.
How do you determine the direction of angular acceleration?
The direction of the angular acceleration is the same as the direction of the net torque vector. Clockwise torque results in clockwise angular acceleration, and counterclockwise torque results in counterclockwise angular acceleration.
What is the first step in solving rotational dynamics problems?
Draw a free body diagram showing all forces acting on the object and their points of application.