# Rotational Equilibrium & Dynamics

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1. torque
• a quantity that measures the ability of a force to rotate an object around some axis
• greater torque means greater ability to rotate an object
2. lever arm
the perpendicular distance from the axis of rotation to the line drawn along the direction of the force
3. center of mass
the point at which all the mass of the body can be considered to be concentrated when analyzing translational motion
4. moment of inertia
the tendency of a body rotating about a fixed axis to resist a change in rotational motion
5. angular momentum
the product of a rotating object's moment of inertia and angular speed about the same axis
6. rotational kinetic energy
the energy of an object due to its rotational motion
7. t=flθ
torque=magnitude of the force x l the distance from the axis of rotation to the force (aka lever arm) x angle btwn force and distance from axis
8. torque SI units
Nm
9. positive/negative rotation
• positive: counter clockwise
• negative: clockwise
10. what produces torque
only the tangential component of force produces torque; not the radial force
11. equilibrium with rotational motion
• neither linear nor rotational motion will change
• all external forces and torques must be zero
12. translational equilibrium
sum of net forces is zero; force condition
13. rotational equilibrium
sum of net torques must be zero; torque condition
14. extended object
object that has a definite, finite size and shape
15. axis of rotation
like a line that passes through a hinge that allows things to rotate
16. relationship btwn lever arm and torque
• farther the force is from the axis of rotation, the easier it is to rotate an object and the more torque is produced
• smaller torque=shorter lever arm
17. center of gravity
position at which Fg acts on extended object as if it were point mass
18. moment of inertia
tendency of a body rotating with a fixed axis to resist a change in rotational motion
19. difference btwn mass and moment of inertia
mass is intrinsic, moment of inertia is not
20. relationship between mass distance from axis and moment of inertia
farther mass is from axis, greater moment of inertia, greater difficulty to rotate
21. relationship btwn mass and moment of inertia
moment of inertia is greater for more massive things
22. second condition for equilibrium
complete equilibrium depends on both no net force and no net torque

## Card Set Information

 Author: Gymnastxoxo17 ID: 275452 Filename: Rotational Equilibrium & Dynamics Updated: 2014-05-27 10:21:54 Tags: Chapter Eight Folders: H Physics Description: d Show Answers:

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