ARMY SIFT EXAM UPDATED Exam
Questions and CORRECT Answers
Law of Inertia - CORRECT ANSWER - an object at rest will stay at rest, and an object in
motion will remain in motion at a constant velocity. Unless acted upon by an unbalanced force.
Sliding or kinetic friction - CORRECT ANSWER - One object slides along the surface of
another object
Fluid friction - CORRECT ANSWER - resistance on an object when it is moved through
air, gas, or a fluid. Ex. fish through water.
Rolling friction - CORRECT ANSWER - friction that occurs when an object rolls over a
surface. Ex. when a bowling ball rolls down and alley.
Static friction - CORRECT ANSWER - Friction that acts on objects that are not moving.
Ex Tash can initially stays in place due to static friction when an attempt is made to move it.
Newton's Second Law - CORRECT ANSWER - Force equals mass times acceleration. A
body is acted upon by a constant force its resulting acceleration is inversely proportional to the
mass and directly proportional to the applied force.
Newton's Third Law - CORRECT ANSWER - For every action there is an equal and
opposite reaction
Newton's Law of Universal Gravitation - CORRECT ANSWER - Every object in the
universe attracts every other object
The force is directly proportional and their masses are inversely proportional to the square of the
distance between them.
Ex. if the distance is increased by 4 the force decreases by a factor of 16 (squared)
, Bernoulli's Principle - CORRECT ANSWER - the rule that a stream of fast moving fluid
exerts less pressure than the surrounding fluid
Fluid Pressure according to Bernoulli principle - CORRECT ANSWER - Fluids moving at
a point in a horizontal pipe at a higher speed have lower pressure than fluids moving at a point at
a slower speed.
Four forces of flight - CORRECT ANSWER - lift, weight, thrust, and drag
Weight - CORRECT ANSWER - The force of gravity pushing the aircraft down
Lift - CORRECT ANSWER - the upward force required to lift the aircraft
Thrust - CORRECT ANSWER - The force applied in order to move the aircraft forward
Drag - CORRECT ANSWER - the force that slows the aircraft down in preparation for
landing
Aircraft weight and balance - CORRECT ANSWER - must be calculated during preflight
Empty Weight Center of Gravity (EWCG) - CORRECT ANSWER - provided by the
aircraft manufacture along with a weight limit.
Manufacturer's Empty Weight (MEW) - CORRECT ANSWER - Total weight of the
aircraft as it was built.
Operating Empty Weight (OEW) - CORRECT ANSWER - MEW plus the weight of the
crew, fluids, unusable fuel, and the equipment required for flight.
Questions and CORRECT Answers
Law of Inertia - CORRECT ANSWER - an object at rest will stay at rest, and an object in
motion will remain in motion at a constant velocity. Unless acted upon by an unbalanced force.
Sliding or kinetic friction - CORRECT ANSWER - One object slides along the surface of
another object
Fluid friction - CORRECT ANSWER - resistance on an object when it is moved through
air, gas, or a fluid. Ex. fish through water.
Rolling friction - CORRECT ANSWER - friction that occurs when an object rolls over a
surface. Ex. when a bowling ball rolls down and alley.
Static friction - CORRECT ANSWER - Friction that acts on objects that are not moving.
Ex Tash can initially stays in place due to static friction when an attempt is made to move it.
Newton's Second Law - CORRECT ANSWER - Force equals mass times acceleration. A
body is acted upon by a constant force its resulting acceleration is inversely proportional to the
mass and directly proportional to the applied force.
Newton's Third Law - CORRECT ANSWER - For every action there is an equal and
opposite reaction
Newton's Law of Universal Gravitation - CORRECT ANSWER - Every object in the
universe attracts every other object
The force is directly proportional and their masses are inversely proportional to the square of the
distance between them.
Ex. if the distance is increased by 4 the force decreases by a factor of 16 (squared)
, Bernoulli's Principle - CORRECT ANSWER - the rule that a stream of fast moving fluid
exerts less pressure than the surrounding fluid
Fluid Pressure according to Bernoulli principle - CORRECT ANSWER - Fluids moving at
a point in a horizontal pipe at a higher speed have lower pressure than fluids moving at a point at
a slower speed.
Four forces of flight - CORRECT ANSWER - lift, weight, thrust, and drag
Weight - CORRECT ANSWER - The force of gravity pushing the aircraft down
Lift - CORRECT ANSWER - the upward force required to lift the aircraft
Thrust - CORRECT ANSWER - The force applied in order to move the aircraft forward
Drag - CORRECT ANSWER - the force that slows the aircraft down in preparation for
landing
Aircraft weight and balance - CORRECT ANSWER - must be calculated during preflight
Empty Weight Center of Gravity (EWCG) - CORRECT ANSWER - provided by the
aircraft manufacture along with a weight limit.
Manufacturer's Empty Weight (MEW) - CORRECT ANSWER - Total weight of the
aircraft as it was built.
Operating Empty Weight (OEW) - CORRECT ANSWER - MEW plus the weight of the
crew, fluids, unusable fuel, and the equipment required for flight.
