View source for Physics for engineer/Force

[[Category:Physics]]
Force represents a strength interacts with matter to perform a task . For example, strength to push and pull a cart to move forward or backward . Force is denoted as '''F''' and measured in Newton unit '''N = Kgm/s '''

==Formula==
 <math>F = ma = m \frac{d^2}{dt^2} s(t) = m \frac{d}{dt} v(t)=  \frac{d}{dt} p(t)</math>

==Types of force==
===Motion Force===
:<math>F = ma = m \frac{d^2}{dt^2} s(t) = m \frac{d}{dt} v(t)=  \frac{d}{dt} p(t)</math>
===Gravity Force===
: <math>-F = -mg = -m \frac{MG}{h^2}</math>

===Friction force===
Force opposes motion force
:<math>F_{\mu} = \mu F_N</math>

===Impulse===
: <math>F = m \frac{v}{t} = \frac{p}{t}</math>
: <math>p = m v = F t</math>

===Elastic Force===
Horizontal Elastic Force 
:<math>F_x = -kx</math>
Vertical Elastic Force 
:<math>F_y = -ky</math>
Inclined Elastic Force 
:<math>F_{\theta} = -l \theta</math>

===Pressure===
Force acts on an area of a surface
:<math>F = \frac{F_N}{A}</math>

===Centripetal Force===
:<math>F = m v r = p r</math>

===Centripetal Force===
:<math>F = m \frac{v}{r} = \frac{p}{r}</math>

===Electromotive Force===
Force acts on electric charge to set electric charge in horizontal linear motion thus creates an electric field
:<math>F_E = Q E</math>

===Electromagnetomotive Force===
Force acts on electric charge to set electric charge in vertical motion perpendicular to initial motion thus creates magnetic  field
:<math>F_E = \pm Q v B</math>

===Electromagnetic Force===
Sum of 2 forces  Electromotive Force and Electromagnetomotive Force act on electric charge to set electric charge in titlted motion thus creates Electromagnetic  field
:<math>F_E = F_E + F_B = QE \pm Q v B = Q(E \pm  v B)</math>
===Attractive Force===
Force negative electric charge attracts positive electric charge 
:<math>F_Q = K \frac{Q_+ Q_-}{r^2} </math>

==Work and Energy==
Work idicates the capability of force to perform a task . Work denoted as '''W''' , measured in unit Newton Meter ''' Nm''' . work can be calculated by
:<math>W = F s = F v t = p v</math>

Energy idicates the capability of force to perform a task over  unit of time . Work denoted as '''E''' , measured in unit Newton Meter per second ''' N m/s''' . work can be calculated by
:<math>E = \frac{W}{t} = F \frac{s}{t} = F v  = F a t = p a</math>