engineering- rotational dynamics

Question 1

what is a moment of inertia?

Answer 1

a measure of resistance to being rotationally accelerated about an axis

Question 2

what is the equation for moment of inertia of a point mass?

Answer 2

I = m r^2

Question 3

what is inertia?

Answer 3

a resistance to a change in velocity when subjected to a force
any mass has it

Question 4

what does it mean if an object has a larger inertia?

Answer 4

a larger force is required to change its velocity by a certain amount

Question 5

what 2 factors affect an object’s moment of inertia?

Answer 5

total mass
how the mass is distributed about the axis of rotation

Question 6

how do you calculate the moment of inertia of a system?

Answer 6

calculating the sum of their moments of inertia

Question 7

how do you find total rotational kinetic energy?

Answer 7

summing the kinetic energies of all the individual particles making up the object

Question 8

what is a flywheel?

Answer 8

a heavy metal disc that spins on an axis and has a large moment if inertia

Question 9

what is angular displacement? what is it’s symbol and units?

Answer 9

the angle turned through in any given direction
θ in radians

Question 10

what is angular speed?

Answer 10

the angle an object moves through per unit time
ω in rads^-1

Question 11

what is the equation for angular velocity?

Answer 11

ω = ∆θ / ∆t