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)
- horsepower - 33,000 foot-pounds per minute or 550 foot-pounds per second
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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