quiz 2 Flashcards
where does rotation occurs
around center of gravity
what is the name of the turning effected produced by a force
a torque
torque depend on
magnitude of external force applies + moment arm
what is a moment arm
distance btw axis of rotation and the line of action of the applied force
what is a centric force + what does it produce
An external force applied directly to the center of gravity + change in linear motion
what is a eccentric force + what does it produce
An external force not directly applied directly through the center of gravity + produce change in linear motion and angular motion
if my moment arm is smaller what does it do to the torque for a same force applied
the torque will be smaller for a same force applied
counterwise rotation = positive or negative
positive
if the net force = 0 will there be a change in linear motion
no, only angular motion
what do we need to have if we want to ensure that there is no angular motion
a net torque= 0
if we want an object to be in static equilibrium what do we need
net torque + force = 0
define center of gravity
point around which all torque sum = 0
what is the angular positon
distance from origin (radius) and angle form btw reference axis and line formed by connecting the point to the origin
what is relative angular position
the reference axis can move
what is absolute angular position
reference axis can’t move
what is angular displacement
change in angular position
all point on the line is angularly displace _ but linear displacement depends on _
same amount
radius
curvilinear displacement is proportional to _ and depend on
angular displacement and depend on how fare away the point is from the axis of rotation
what is angular velocity
rate of change of angular displacement
angular velocity varie throughout
change in angular position
what is tangential linear velocity
linear velocity of a point on a rotating segment
tangential linear velocity depend on
how fast a point move depends on how far that point is from the axis of rotation
what is angular acceleration
change in magnitude and/or direction of the angular velocity with respect to time
angular acceleration vary throughout
change in angular position
what tangential linear acceleration
linear acceleration tangent to the circular path of a point on a rotating object
what is centripetal acceleration
linear acceleration directed toward the axis of rotation. Caused by change in direction of the velocity vector
with a smaller radius do we need more or less force to throw an object at the same distance
more
if angular velocity doesn’t change what does it means
no acceleration and no torque applied
what is inertia
resistance of a system to have its state of motion change by a force
inertia depend on
mass, mass distribution, axis of rotation
what is radius of gyration
distance that represent how far the mass is from an axis of rotation if its mass were concentrated at one point
angular acceleration is _proportional to the net torque and _ proportional to rotational inertia
directly, inversely
what is the most efficient way to move a body
maximize acceleration and minimize torque (decrease moment of inertia)
will they be a change in momentum without an force externally applied
no
what happened when we manipulated moment of inertia
change in angular velocity
what is angular impulse
product of applied torque and interval of torque application
