Rotational Motion & Torque Flashcards
Inertia
tendency for an object to continue to remain at rest or
in constant motion
Rotational Inertia
(or angular inertia) tendency for an object to continue to rotate
Moment of Inertia
(I) a quantitative measure of the rotational inertia of an object. Units kg m^2
Moment of Inertia for a point amss
I = mr^2
Torque
(T) is a vector quantity that measures the effectiveness of a force in causing rotation. Units: 1Nm
Is Torque interchangeable with Energy and Work?
Hell no
Axis of Rotation
Point around which an object rotates
Fulcrum (or pivot)
Point around which a lever pivots
Lever Arm
Distance from axis of rotation that a force is applied, causing torque.
Rotational Equilibrium
When all of the torques on an object cancel each other’s effects and the object rotates with constant angular velocity or not at all.
Line of action
The line that the Force makes on a lever.
What Torque equation does Newtons 2nd Law give us?
Tnet=Ia
Counter-clockwise has what sign?
Positive
Clockwise has what sign?
Negative
Is Torque “felt”?
No the force is what one experiences
What is the slope of an angular position vs. time graph?
Angular velocity
Angular Momentum
(L) is a vector quantity from the product of the moment of inertia and angular velocity. It is conserved.
Describe MOI and Angular velocity for a person spinning with their arms out
High Moment of Inertia, Low Angular velocity
Describe MOI and Angular velocity for a person spinning with their arms in.
Low moment of Inertia, High angular Velocity
