engineering- rotational dynamics Flashcards
what is a moment of inertia?
a measure of resistance to being rotationally accelerated about an axis
what is the equation for moment of inertia of a point mass?
I = m r^2
what is inertia?
a resistance to a change in velocity when subjected to a force
any mass has it
what does it mean if an object has a larger inertia?
a larger force is required to change its velocity by a certain amount
what 2 factors affect an object’s moment of inertia?
total mass
how the mass is distributed about the axis of rotation
how do you calculate the moment of inertia of a system?
calculating the sum of their moments of inertia
how do you find total rotational kinetic energy?
summing the kinetic energies of all the individual particles making up the object
what is a flywheel?
a heavy metal disc that spins on an axis and has a large moment if inertia
what is angular displacement? what is it’s symbol and units?
the angle turned through in any given direction
θ in radians
what is angular speed?
the angle an object moves through per unit time
ω in rads^-1
what is the equation for angular velocity?
ω = ∆θ / ∆t
