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Lecture 15- Torque, F=ma for rotation, and Equilibrium

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for equilibrium in a rotating system, _ must be 0

Front

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Physics

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Date created

Mar 1, 2020

Cards (32)

Section 1

(32 cards)

for equilibrium in a rotating system, _ must be 0

Front

rotational acceleration, torque

Back

equation to find linear acceleration from rotational acceleration

Front

R*rotational acceleration

Back

_ moment of inertia means it is hard to stop or start rotation

Front

large

Back

torque is _ for counter-clockwise rotation

Front

positive

Back

work equation for wheel using torque

Front

torque*theta

Back

work equation for a wheel

Front

Ftangential*s

Back

gravitational force acts as force at _

Front

center of mass

Back

if object has no linear acceleration but a non-zero torque, it will _

Front

not translate but will rotate

Back

rotational mass is also known as

Front

moment of inertia

Back

if someone lets their arm swing freely from an initial straight-out parallel-to-the-ground position, when is the angular acceleration of the arm about the shoulder the greatest?

Front

immediately after the arm begins to swing

Back

if there is a force on the pivot, the torque it produces is _

Front

0

Back

S = _

Front

r*theta

Back

equation for torque about pivot due to gravity

Front

mgd

Back

torque acting on a twisting wrench is greatest when force is pointing _

Front

perpendicular to wrench

Back

equation for torque using force

Front

r*Fsintheta

Back

a force x distance that causes a rotation- tells how effective a force is at twisting or rotating an object

Front

torque

Back

at what angle can you hold out your arm to make torque about the shoulder due to the weight of the arm the greatest?

Front

parallel to the ground

Back

force that causes rotation

Front

torque

Back

two people lift a heavy long. one on the left is standing closer to the center of mass, the one on the right is standing farther from the center of mass. which of the 2 people is supporting the greatest weight?

Front

person on the left

Back

how to find perpendicular force

Front

Fsintheta

Back

work done by torque

Front

torque*theta

Back

object is not in _ when gravitational force acts on it

Front

static equilibrium

Back

if F and r are _, then torque = 0

Front

parallel

Back

an object is made by hanging a ball from one end of a plank having the same mass. the object is placed on a support at a point 1/4 from the end of the plank supporting the ball. Is the object balanced?

Front

yes

Back

perpendicular force acting on a longer wrench means torque is _ than when the same force acts perpendicular on a shorter wrench

Front

greater

Back

_ causes rolling

Front

static friction

Back

_ is amount of twist provided by a force

Front

torque

Back

the angular version of Force

Front

torque

Back

torque is _ for clockwise rotation

Front

negative

Back

equation for torque using inertia

Front

inertia*angular acceleration

Back

equation for linear acceleration of a sphere

Front

5/7g*sintheta

Back

F=ma for rotation

Front

T= I*angular acceleration

Back