PLTW Principles of Engineering
(Semester 1 Final) Exam Questions &
Answers8
Effort Force - ANSWERS-An external force applied to an object.
Efficiency - ANSWERS-The ratio of useful energy output to the total energy input, or the
percentage of the work input that is converted to work output.
Friction - ANSWERS-The resitance that one surface or object encounters when moving over
another.
Gear - ANSWERS-A circular toothed object used to transfer rotary motion and torque through
interlocked teeth.
Ideal Mechanical Advantage - ANSWERS-Ratio of distance traveled by the applied effort and
resistance force within a system.
Lever - ANSWERS-A rigid bar used to exert a pressure or sustain a weight at one point of its
length by the application of a force at a second and turning at a third on a fulcrum.
Mechanism - ANSWERS-The structure of or the relationship of the parts in a machine, or in a
construction or process comparable to a machine.
Moment - ANSWERS-The turning effect of a force about a point equal to the magnitude of the
force times the perpendicular distance from the point to the line of action from the force.
, Resistance Force - ANSWERS-Impeding effect exerted by one material object on another.
Simple Machine - ANSWERS-Any of various elementary mechanisms including the lever, the
wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Static Equilibrium - ANSWERS-A condition where there are no net external forces acting upon a
particle or rigid body and the body remains at rest or continues at a constant velocity.
Torque - ANSWERS-A force that produces or tends to produce rotation or torsion.
Alternative Energy - ANSWERS-Any source of energy other than fossil fuels that is used for
consructive purposes.
Ampere - ANSWERS-The unit of electric current in the meter-kilogram-second system of units.
Referred to as amp and symbolized as A.
Biomass - ANSWERS-Plant materials and animal waste used especially as a source of fuel.
Current - ANSWERS-The net transfer of electric charge (electron movement along a path) per
unit of time.
Electrical Energy - ANSWERS-Energy caused by the movement of electrons.
Electricity - ANSWERS-The flow of electrical power or charge.
Efficiency - ANSWERS-The ratio of the useful energy delivered by a dynamic system to the
energy supplied to it.
(Semester 1 Final) Exam Questions &
Answers8
Effort Force - ANSWERS-An external force applied to an object.
Efficiency - ANSWERS-The ratio of useful energy output to the total energy input, or the
percentage of the work input that is converted to work output.
Friction - ANSWERS-The resitance that one surface or object encounters when moving over
another.
Gear - ANSWERS-A circular toothed object used to transfer rotary motion and torque through
interlocked teeth.
Ideal Mechanical Advantage - ANSWERS-Ratio of distance traveled by the applied effort and
resistance force within a system.
Lever - ANSWERS-A rigid bar used to exert a pressure or sustain a weight at one point of its
length by the application of a force at a second and turning at a third on a fulcrum.
Mechanism - ANSWERS-The structure of or the relationship of the parts in a machine, or in a
construction or process comparable to a machine.
Moment - ANSWERS-The turning effect of a force about a point equal to the magnitude of the
force times the perpendicular distance from the point to the line of action from the force.
, Resistance Force - ANSWERS-Impeding effect exerted by one material object on another.
Simple Machine - ANSWERS-Any of various elementary mechanisms including the lever, the
wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Static Equilibrium - ANSWERS-A condition where there are no net external forces acting upon a
particle or rigid body and the body remains at rest or continues at a constant velocity.
Torque - ANSWERS-A force that produces or tends to produce rotation or torsion.
Alternative Energy - ANSWERS-Any source of energy other than fossil fuels that is used for
consructive purposes.
Ampere - ANSWERS-The unit of electric current in the meter-kilogram-second system of units.
Referred to as amp and symbolized as A.
Biomass - ANSWERS-Plant materials and animal waste used especially as a source of fuel.
Current - ANSWERS-The net transfer of electric charge (electron movement along a path) per
unit of time.
Electrical Energy - ANSWERS-Energy caused by the movement of electrons.
Electricity - ANSWERS-The flow of electrical power or charge.
Efficiency - ANSWERS-The ratio of the useful energy delivered by a dynamic system to the
energy supplied to it.
