# Applied Kinesiology-Exam 2

## Terms

undefined, object
copy deck
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 Application-the point at which the force is being applied to the system.
4. Line of Action Force-the 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 = (vf-vi)/(tf-ti)
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)

54