Rotating systems Flashcards
How many radians are on 1 rotation?
6.28 radians
True or false?
The angular speed is the same for every point in a rotating object.
TRUE
True or false?
The translational speed is the same for all points in a rotating object.
FALSE
What is angular acceleration?
The change in angular velocity that a spinning object undergoes per unit time.
Net forces cause …………… of the COM of an object.
Movement
What is rotational inertia?
The harder an object is to rotate.
What 2 things increase rotational inertia?
Increased mass, Mass further away from COM.
What is torque and its unit?
Torque is a twisting force which causes rotation. Its unit is Nm.
What are the units for rotational inertia?
Kgm^2
What are 2 ways to calculate angular momentum?
Using either of 2 equations.
1: (Rotational) L=lw
2: (Linear) L=mvr
When is angular momentum not conserved?
If there are any external torques (turning forces)
What is the formula for rotational kinetic energy?
Ek(rot) = 1/2 lw^2
What are the 2 main types of energy? (discussed in L3 physics)
Kinetic energy & Potential energy
Will an object with a lower rotational inertia roll slower or faster?
Faster
