Mechanical Comp Flashcards
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27 Terms
a longer wrench makes a stubborn bolt easier to turn because it increases…
torque for the same applied force
two external gears mesh directly. If the driver turns clockwise, the driven gear turns…
counterclockwise
a small driving gear turns a larger driven gear. The larger gear generally turns…
slower with more torque
a large driving gear turns a smaller driven gear. The smaller gear generally turns…
faster
a fixed pulley primarily…
changes the direction of the applied force
an inclined plane reduces the input force needed to raise a load mainly by…
increasing the distance over which force is applied
a hydraulic system primarily uses…
liquid
a pneumatic system primarily uses…
compressed gas
at the same pressure, a larger piston area produces…
greater force
lowering an object's center of gravity generally makes it…
more stable
widening an object's support base generally makes it…
more resistant to tipping
a rope supporting a hanging load is mainly under…
tension
a vertical column supporting a load is commonly under…
compression
a force tending to slide adjacent layers past each other is…
shear
lubrication between moving surfaces generally…
reduces friction and wear
brake pads slow a rotor mainly through…
friction
a rack-and-pinion mechanism converts…
rotary motion to linear motion, or vice versa
bevel gears are commonly used to transmit rotation between…
intersecting shafts
which action directly compresses a material?
squeezing
if pressure on one side of a movable valve is greater than on the other, the net pressure force tends to move it toward
the…
lower-pressure side
100-newton force acts perpendicular to a lever 0.5 m from its pivot. Torque is…
50 N-m
friction between two surfaces acts to…
oppose their relative motion or tendency to move
a wheel-and-axle device can provide mechanical advantage when…
input force is applied at a larger radius than the output load radius
in a simple lever, the fulcrum is…
the pivot point
a beam supported at both ends and loaded in the middle will generally experience its greatest bending moment…
near the middle for a simple symmetric point load