ASVAB Mechanical Comprehension
Force - mass × acceleration
Vector quantities - forces that has both size and direction
Equilibrium - a stable situation in which forces cancel one another
Velocity - the speed and direction of a moving object
Acceleration - the rate at which velocity changes
Pressure - force (in pounds) ÷ area (in inches)
Work - force × distance
Tension is measured in - pounds-force or newtons
Work is measured in - foot-pounds
Power - work ÷ time
Power is measured in - horsepower (hp)
1 horsepower - 33,000 foot-pounds per minute or 550 foot-pounds per second
Mechanical advantage - when a machine multiplies the force you use
Mechanical advantage - resistance ÷ effort = output force ÷ input force
Fulcrum - point of support to reduce resistance and multiply the effect of effort
Resistance arm - the part of a lever that applies a force on an object
Effort arm - the part of a lever that you apply an input effort force to.
to determine how much a lever reduces the amount of effort needed to do work - length of
effort arm ÷ length of resistance arm = resistance force ÷ effort force
Mechanical advantage of using a lever - effort arm ÷ resistance arm
Mechanical advantage of using a ramp - length of ramp ÷ height of ramp = weight of object
being moved ÷ force required to move object
Force - mass × acceleration
Vector quantities - forces that has both size and direction
Equilibrium - a stable situation in which forces cancel one another
Velocity - the speed and direction of a moving object
Acceleration - the rate at which velocity changes
Pressure - force (in pounds) ÷ area (in inches)
Work - force × distance
Tension is measured in - pounds-force or newtons
Work is measured in - foot-pounds
Power - work ÷ time
Power is measured in - horsepower (hp)
1 horsepower - 33,000 foot-pounds per minute or 550 foot-pounds per second
Mechanical advantage - when a machine multiplies the force you use
Mechanical advantage - resistance ÷ effort = output force ÷ input force
Fulcrum - point of support to reduce resistance and multiply the effect of effort
Resistance arm - the part of a lever that applies a force on an object
Effort arm - the part of a lever that you apply an input effort force to.
to determine how much a lever reduces the amount of effort needed to do work - length of
effort arm ÷ length of resistance arm = resistance force ÷ effort force
Mechanical advantage of using a lever - effort arm ÷ resistance arm
Mechanical advantage of using a ramp - length of ramp ÷ height of ramp = weight of object
being moved ÷ force required to move object
