36 terms

# jc science physics leavers and torque chapter 36

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force
A push or pull
force formula
Force = Mass x Acceleration. The is measured in units called Newtons (N). AKA 1N = 1kg x 1m/s² (p.45)
torque
A force that produces or tends to produce rotation or torsion.(Moment Nm)
Newton (N)
metric unit used to measure force
spring scale
calibrated in newtons measures weight or force in calibrated in grammes to measure mass
a lever
is a rigid structure that can move around a fixed point called a fulcrum
moment of a force
is equal to the force multiplied by the perpendicular distance between the force and the fulcrum.
Number of times a machine multiplies the effort force
A gain in effort or distance or a change of direction resulting from the use of a simple machine
class 1 lever
A lever in which the fulcrum is between the load and the effort.
class 2 lever
A lever in which the load is between the fulcrum and the effort.
class 3 lever
A lever in which the effort is between the fulcrum and the load
effort
The force applied to move a load using a simple machine
fulcrum
the fixed point about which a lever arm pivots
lever or lever arm
A beam, free to pivot around a point, used to move a load.
The weight or resistance that is moved using a simple machine.
simple machine
any of the six elementary devices(including levers and pulleys,wedges screw inclined plane wheel and axil) that provide mechanical or other advantage
Class 3
What class of lever is this diagram?
Class 1
What class of lever is this diagram?
Class 2
What class of lever is this diagram?
Class 1 fulcrum in the middle
What class of lever is this simple machine?
Class 2 load in the middle
What class of lever is this simple machine?
Class 3 effort in the middle
What class of lever is this simple machine?
"the one in the middle"
classes of levers are found by identifying this section of the lever system
torque wrench
used when a specific force must be applied to a nut or bolt head.
deflecting beam, dial indicating, and micrometer, slipes when a specific level of tightness is reached preventing overtightness
center of gravity
The point at the center of an object's weight distribution, where the force of gravity can be considered to act.
equilibrium
a state of balance or equality between opposing forces resultant net force zero
stable equilibrium
the state of an object balanced so that any small displacement or rotation raises its center of gravity, causing it to return to its origional position eg a half full bottle standing on its base
unstable equilibrium
the state of an object balanced so that any small displacement or rotation lowers its center of gravity eg bottle standing on its neck
neutral equilibrium
the state of an object balanced so that any small movement neither raises nor lowers its center of gravity eg rolling bottle on a flat surface.
law of the lever
When balanced, the sum of the clockwise moments equal to the sum of the anticlockwise moments
method used to increase stability
-make the base wide
-lower the centre of gravity
top heavy objects have ______________________ making them unstable
a high center of gravity
formula 1 cars have a low C.G. and a _____________________ making them stable
wide base
A double decker bus has to be filled from the bottom up to___________________stability
maintain
a tight rope walker
___________________________ uses a heavy pole to keep C.G over their narrow base thereby maintaining stability

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