honors physics chapter 11

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list three ways in which a person can increase the torque that they apply to a system
increase/lengthen lever arm
increase force
apply force perpendicular to lever arm
when does a system topple
when the center of gravity of an object is below the area of support
what type of person has the greatest stability
women
which type of person has the least stability
children
which type of person has moderate stability
men
what causes a rotating system to wobble
if its center of gravity is not in line with its axis of symmetry
torque
a force that causes rotation
if tcw=fd an tccw=fd, then...
the torques are balanced
how can you increase the lever arm of a screwdriver
putting a wrench on the lever arm.
ccw
acronym for counter clockwise
toppling
occurs when cg is not above support base
negative
buoyancy that causes an object to sink through a medium
balanced
when cw and ccw torques are equal and no rotation occurs
leverage
the use of a long lever arm to increase torque
positive
buoyancy that causes an object to rise through a medium
torque
the product of force and lever arm measured in newton-meters
stable
an object that raises its cg with any displacement
plumb bob
a weighted object tied to a string and used to determine a vertical line
children
humans with highest cgs
neutral
an object that neither raises nor lowers its CG with any displacement
unstable
an object that lowers its CG with any displacement
cw
acronym for clockwise
distance
lever arm from axis of rotation to location where force is applied
wobbling
motion that results when CG is not located at the axis or rotation
neutral
buoyancy that causes an object to remain suspending in the medium that they displace
women
humans with he lowest CGs
equilibrium
when no rotation occurs because sigma torque = 0Nm
CG
acronym for center of gravity. the point where weight is measured from
how is torque calculated
t=Fd
how can force be maximized
>force
>distance
apply perpendicular force
what happens when torques balance
a) tcw=tccw
b) sigma t = 0N
c) no rotation
d) all of these
e) none of these
d) all of these
what is the lever arm of a screwdriver
its radius
what proportionality exists between the force and distance that yields a given torque
inverse
a cone resting on its flat base is in what type of equilibrium
stable
how does a physicist express the term righty tighty
tcw
what happens when the cg of a system is not above its support base
toppling
which child must sit closer to the fulcrum of a teeter totter in order to balance torques
the heavy one
where must the fulcrum of an empty meter stick lever be located in order to balance torques
@CG
which factor makes a building stable
a) wide support base
b) low CG
c) both
d)none
c) both of these
which end of the baseball bat has the greater mass when it balances horizontally on its fulcrum
the short barrel
what does a wobbling star indicate to astronomers
a) planets
b) cg away from axis
c) both of these
d) none of these
c) both of these
what happens to the CG of a glass of water when a ping pong ball is pushed below its surface
it rises
what happens when an axis of rotation is not located at the CG
wobbling
when a high jumper clears the bar, where does her CG go
under the bar
what portion of a baseball bat follows a smooth parabolic flight path when thrown through air
the bat's CG
what can a torque cause
rotation
which type of people have the lowest stability and the highest CG
children
what happens to the CG of a system in unstable equilibrium as it topples
it moves down
which term describes the distance between the axis and applied force that causes rotation
lever arm
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