USPS 943 EXAM STUDY GUIDE 2026 LATEST
QUESTIONS AND ACCURATE ANSWERS
PREMIUM RESOURCE GRADED A+
⩥ HMI (Human Machine Interface).
Answer: A PLC device that provides means of automated systems and
people's interaction with the PLC control system.
⩥ lever.
Answer: Simple machine that provides a mechanical advantage in
carrying loads
⩥ fulcrum.
Answer: Hinge point for the lever
⩥ input force.
Answer: The effort that converts into output force
⩥ output force.
Answer: The output force carries the load in a lever
⩥ 1st class lever.
,Answer: fulcrum is located between the input and output forces
⩥ Torque.
Answer: a force that causes rotation
⩥ 2nd class lever.
Answer: fulcrum at the end, load in the middle; wheel barrow, car-jack
⩥ 3rd class lever.
Answer: fulcrum at the end, effort in the middle; tweezers, baseball bat
⩥ gear.
Answer: A wheel with equally sized and spaced teeth located on its
circumference
⩥ circumference.
Answer: The distance around a circle
⩥ Gear Ratio Formula.
Answer: Number of teeth in wheel 1/number of teeth in wheel 2 =
Velocity of wheel 2/velocity of wheel 1
,⩥ Pulley.
Answer: A simple machine that consists of a grooved wheel with a rope
or cable wrapped around it.
⩥ fixed pulley.
Answer: A pulley that is attached to a structure
⩥ moveable pulley.
Answer: A pully that is directly attached to the load. Provides a
mechanical advantage by dividing the weight between the part of the
rope connected to the ceiling and the part that is pulled.
⩥ Applied force formula.
Answer: F=W/N (Number of ropes)
⩥ Length of rope pulled formula.
Answer: L= vertical distance of the load lifted (D)/Number of Load
supporting ropes (N)
⩥ spring.
Answer: Object used to store mechanical energy
⩥ Hooke's Law Formula.
, Answer: F = kx (spring constant x extension)
⩥ Incline Plane.
Answer: A flat supporting surface tilted on an angle, used to help raise or
lower a load with less work
⩥ wedge.
Answer: A compound tool that is triangular in shape. Can be used to
seperate two objects or portions of an object, lift an object, or hold an
object in place.
⩥ Screw.
Answer: Converts rotational motion into linear motion and a torque to a
linear force.
⩥ centrifugal force.
Answer: Outward force that draws a rotating body away from the center
of rotation. Opposite direction to the center of the circle
⩥ centripedal force.
Answer: The inward force that makes bodies follow a curved path and is
the cause of circular motion. The direction will move toward the center
of the circle.
QUESTIONS AND ACCURATE ANSWERS
PREMIUM RESOURCE GRADED A+
⩥ HMI (Human Machine Interface).
Answer: A PLC device that provides means of automated systems and
people's interaction with the PLC control system.
⩥ lever.
Answer: Simple machine that provides a mechanical advantage in
carrying loads
⩥ fulcrum.
Answer: Hinge point for the lever
⩥ input force.
Answer: The effort that converts into output force
⩥ output force.
Answer: The output force carries the load in a lever
⩥ 1st class lever.
,Answer: fulcrum is located between the input and output forces
⩥ Torque.
Answer: a force that causes rotation
⩥ 2nd class lever.
Answer: fulcrum at the end, load in the middle; wheel barrow, car-jack
⩥ 3rd class lever.
Answer: fulcrum at the end, effort in the middle; tweezers, baseball bat
⩥ gear.
Answer: A wheel with equally sized and spaced teeth located on its
circumference
⩥ circumference.
Answer: The distance around a circle
⩥ Gear Ratio Formula.
Answer: Number of teeth in wheel 1/number of teeth in wheel 2 =
Velocity of wheel 2/velocity of wheel 1
,⩥ Pulley.
Answer: A simple machine that consists of a grooved wheel with a rope
or cable wrapped around it.
⩥ fixed pulley.
Answer: A pulley that is attached to a structure
⩥ moveable pulley.
Answer: A pully that is directly attached to the load. Provides a
mechanical advantage by dividing the weight between the part of the
rope connected to the ceiling and the part that is pulled.
⩥ Applied force formula.
Answer: F=W/N (Number of ropes)
⩥ Length of rope pulled formula.
Answer: L= vertical distance of the load lifted (D)/Number of Load
supporting ropes (N)
⩥ spring.
Answer: Object used to store mechanical energy
⩥ Hooke's Law Formula.
, Answer: F = kx (spring constant x extension)
⩥ Incline Plane.
Answer: A flat supporting surface tilted on an angle, used to help raise or
lower a load with less work
⩥ wedge.
Answer: A compound tool that is triangular in shape. Can be used to
seperate two objects or portions of an object, lift an object, or hold an
object in place.
⩥ Screw.
Answer: Converts rotational motion into linear motion and a torque to a
linear force.
⩥ centrifugal force.
Answer: Outward force that draws a rotating body away from the center
of rotation. Opposite direction to the center of the circle
⩥ centripedal force.
Answer: The inward force that makes bodies follow a curved path and is
the cause of circular motion. The direction will move toward the center
of the circle.
