OAR Mechanical Comprehension
Scalars - Answer-Quantities that are fully described by a magnitude alone.
Vectors - Answer-Quantities that are fully described by both a magnitude and a direction.
Distance - Answer-Scalar quantity that refers to "how much ground an object has covered" during its
motion.
Displacement - Answer-Vector quantity that refers to "how far out of place an object is" it is the object's
overall change in position.
Speed - Answer-Scalar quantity that refers to "how fast an object is moving."
Velocity - Answer-Vector quantity that to "the rate at which an object changes its position."
Force - Answer-Vector Quantity that describes the force acting up an object.
Contact Forces:
Frictional, Tension, Normal, Air Resistance, Force, Applied, and Spring
Action-at-a-Distance Forces:
Gravitational, Electrical, and Magnetic
, Average Speed - Answer-Average Speed =
Distance Traveled/ Time of Travel
Average Velocity - Answer-position/time = displacement/time
Acceleration - Answer-Vector quantity that is defined as the rate at which an object changes its velocity.
Ave. Acceleration - Answer-Velocity/Time
Mechanical Advantage - Answer-output force/input force = MA
Maximum Weight Questions - Answer-Force x Mechanical Advantage = MW
If the rope on the end of a pulley system with a MA of 3 is pulled with 160 pounds of force, what is the
maximum weight that can be lifted? - Answer-160 x 3 = 480 lbs
Force Necessary Questions - Answer-Weight/MA
Mechanical Advantage of an incline plane - Answer-length/height = MA
A 240-pound block is being pulled up an incline by a pulley. The incline is 20 feet long and rises 5 feet.
Neglecting friction, how much force is necessary to move the block up the incline? - Answer-20/5 = 4
240/4 = 60
Scalars - Answer-Quantities that are fully described by a magnitude alone.
Vectors - Answer-Quantities that are fully described by both a magnitude and a direction.
Distance - Answer-Scalar quantity that refers to "how much ground an object has covered" during its
motion.
Displacement - Answer-Vector quantity that refers to "how far out of place an object is" it is the object's
overall change in position.
Speed - Answer-Scalar quantity that refers to "how fast an object is moving."
Velocity - Answer-Vector quantity that to "the rate at which an object changes its position."
Force - Answer-Vector Quantity that describes the force acting up an object.
Contact Forces:
Frictional, Tension, Normal, Air Resistance, Force, Applied, and Spring
Action-at-a-Distance Forces:
Gravitational, Electrical, and Magnetic
, Average Speed - Answer-Average Speed =
Distance Traveled/ Time of Travel
Average Velocity - Answer-position/time = displacement/time
Acceleration - Answer-Vector quantity that is defined as the rate at which an object changes its velocity.
Ave. Acceleration - Answer-Velocity/Time
Mechanical Advantage - Answer-output force/input force = MA
Maximum Weight Questions - Answer-Force x Mechanical Advantage = MW
If the rope on the end of a pulley system with a MA of 3 is pulled with 160 pounds of force, what is the
maximum weight that can be lifted? - Answer-160 x 3 = 480 lbs
Force Necessary Questions - Answer-Weight/MA
Mechanical Advantage of an incline plane - Answer-length/height = MA
A 240-pound block is being pulled up an incline by a pulley. The incline is 20 feet long and rises 5 feet.
Neglecting friction, how much force is necessary to move the block up the incline? - Answer-20/5 = 4
240/4 = 60
