Lesson: Newton’s Second Law of Motion for RotationPhysics
In this lesson, we will learn how to compare moment of inertia, torque, and angular acceleration with mass, force, and acceleration in linear motion.
Sample Question Videos
A flywheel with a moment of inertia of kg⋅m2, that has an initial angular velocity of 52.36 rad/s is brought to rest by frictional torque in a time of 120 s. What is the average frictional torque on the flywheel?
A grindstone of mass 75.0 kg consists of a solid disk with a radius of 0.280 m. A force of magnitude 180 N is applied tangentially to the disk and negligible friction resists the motion of the grindstone.
What is the magnitude of the torque exerted by the applied force?
What is the magnitude of the angular acceleration of the grindstone due to the applied force?
A frictional force of magnitude 20.0 N opposes the applied force on the grindstone at a distance of 1.50 cm from its axis. What is the magnitude of the grindstone’s angular acceleration taking this friction into account?
A constant torque is applied to a rigid body whose moment of inertia is 4.0 kg⋅m2 around the axis of rotation. If the wheel starts from rest and attains an angular velocity of 20.0 rad/s in 10.0 s, what is the magnitude of the applied torque?