All Flashcards
What is torque?
Torque is a rotational force that can transfer energy to or from an object when applied over an angular displacement.
Define angular displacement.
Angular displacement is the angle through which an object rotates.
What is work in the context of rotational motion?
Work in rotational motion is the energy transferred by a torque acting over an angular displacement.
Define moment of inertia.
Moment of inertia is a measure of an object's resistance to changes in its rotational motion.
What is rotational kinetic energy?
Rotational kinetic energy is the kinetic energy due to the rotation of an object and is given by , where I is the moment of inertia and is the angular velocity.
What is the effect of applying a torque in the same direction as the angular displacement?
Energy is transferred into the system, increasing its rotational kinetic energy.
What is the effect of applying a torque in the opposite direction as the angular displacement?
Energy is transferred out of the system, decreasing its rotational kinetic energy.
What happens to the work done if you double the torque?
The work done is doubled.
What happens to the work done if you double the angular displacement?
The work done is doubled.
How do you determine work done from a torque-angle graph?
Calculate the area under the curve of the graph.
How do you determine the sign of work done by torque?
If torque and angular displacement are in the same direction, work is positive. If they are in opposite directions, work is negative.