Applied KinesiologyExam 2
Terms
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 Newton's First Law

aka Law of Inertia.
A body at rest or in uniform Motion will remain at rest or in uniform motion unless some external force is applied to it.  Inertia
 The body's reluctance to change whatever its doing (this remaining stationary). Also characterized as the "laziness of an object".
 Mass
 Mass is a scalar quantity because it has magnitude only.
 Unit of Mass
 In kilograms (kg) or grams (g) in the metric and slugs int he English system
 Newton's Second Law
 When a body acted upon by a constant force, its relucting acceleration is proportional to the force applied and inversely proportional to the mass and the acceleration takes place in direction in which the force acts.
 Newton's Third Law

To every action, there is an equal and opposite reaction.
When a body is at rest or in motion, the state of the body depends upon the reaction forces acting on it and not upon the action forces the body exerts on their bodies.  Pound
 a force when applied to a mass of 1 slug. It will produce an acceleration of 1ft/s2.
 Newton
 a force when applied to a mass of 1kg it will produce an acceleration of 1m/s2.
 Weight
 weight and force have both magnitude and direction and are thus vector quantities.
 Newton's 4th Law

aka Law of Universal Gravitational.
any two bodies attract each other with a force proportional to the product of their masses and universely proportional to the square of the distance between them.  Work

force times the distance through the force acts
w = f x d 
Mass
ENGLISH  slugs (s)

Mass
METRIC  kilogram (kg)

Acceleration
ENGLISH  ft/s2

Acceleration
METRIC  m/s2

Force
ENGLISH  slugft/s2 (pound)

Force
METRIC  kgm/s2 (N)

Work
ENGLISH  ftlb

Work
METRIC  mN or (Joules)

Power
ENGLISH  ftlb/s

Power
METRIC  mN/s (J/s or Watt)

Potential Energy
ENGLISH  ftlb

Potential Energy
METRIC  mN (Joule)

Kinetic Energy
ENGLISH  ftlb

Kinetic Energy
METRIC  mN or (Joules)
 Power
 the rate at which work is being done or time rate of performing work
 Power (equations)

power = work/time
power = (f x d)/time
power = f (d/t)
power = f x v  Energy
 the capacity to do work
 6 Forms of Energy

1. Chemical
2. Electric
3. Heat
4. Light
5. Mechanic
6. Nuclear  Torque
 The larger thr force applied or the longer the force arm or both the greater the torque produced.
 Force Arm
 The perpendicular distance or the shortest distance from the axis of rotation to the line of action of the force
 Torque (L)
 = Force (F) x Force Arm (dI)
 Properties of Torque

1. magnitude of how much turning effect
2.Direction of turning effect
3. Point of Force Applicationthe point at which the force is being applied to the system.
4. Line of Action Forcethe line in which the force is being applied it extends in either direction and provides a reference line for determining the length of the force arm  Force
 For two equal forces applied to a body, the force that has the longer force arm produces the greater torque

Speed
ENGLISH  ft/s

Speed
METRIC  m/s

Speed
FORMULA  s = l/t

Velocity
ENGLISH  ft/s

Velocity
METRIC  m/s

Velocity
FORMULA  v = d/t

Acceleration
FORMULA  a = (vfvi)/(tfti)

Mass
ENLGISH  slug

Force
ENLGISH  slugft/s2 (pound)

Force
FORMULA  f = ma

Weight
ENGLISH  slugft/s2 (pound)

Weight
METRIC  kgm/s2 (N)

Weight
FORMULA  Fg = mg

Power
FORMULA  p = f(d/t) or f(v)

Potential Energy
FORMULA  PE = mgh or Wh

Kinetic Energy
METRIC  mN (Joule)

Kinetic Energy
FORMULA  KE = 1/2 mv2

Torque
ENGLISH  lbft

Torque
METRIC  Nm (Joule)

Torque
FORMULA  L = f(DI)