Physics Course/Force/Force

Force

Force is a term used to describe a quantity that acts on an object to change object's state or to perform a task on the object. Example Force used to push or pull a cart or force used to break a stick

Force's Characteristics

Force's Pressure

Force exerts on a cross sectional area of a surface of an object is called Pressure

$P={\frac {F}{A}}$ Work Done

The ability of a Force to carry out a task on an object is defined Work done on the object . Work done by a force on an object to move object over a distance s is defined as the product of Force and Distance move

$W=Fs=Fvt=pv$ $W=F\int v(t)dt$ Energy

The ability of a Force to carry out a task on an object over a period of Time .

$E={\frac {W}{t}}=F{\frac {s}{t}}=Fv=Fat=pa$ $E={\frac {F}{t}}\int v(t)dt$ Types of Force

Motion Force

Motion Force is a force used to set an object in motion . Force to make an object move is calculated by

$F=ma$ $F=m{\frac {v}{t}}={\frac {p}{t}}$ For any motion of speed v(t) caused by a force

$F=m{\frac {dv(t)}{dt}}$ Gravitational Force

Attraction's Force of the Earth to attract any object toward the Earth

$g=G{\frac {m}{r^{2}}}$ $F_{g}=Mg=G{\frac {mM}{r^{2}}}$ ElectroMotive Force

ElectroMotive Force is the electric force that set stationary charge to move in a straight horizontal line

$F_{E}=qE$ ElectroMagnetoMotive Force

ElectroMagnetoMotive Force is the magnetic force that set the moving charge to move in perpendicular to the horizontal direction

$F_{B}=\pm vB$ ElectroMagnetic Force

ElectroMagnetic Force is the sum of the Electric Field Force and the Electric force

$F_{E}B=F_{E}+F_{B}=q(E\pm vB)$ Summary

Force is used to to describe a quantity that acts on matter to perform a task

1. To cause an object to move or to set an object in motion . Example to push or pull a door
2. To cause matter to change its state . Example change Solid to Liquid to Gas
Force Definition Formula
Motion Force Force causes an object's motion F = m a = ${\frac {mv}{t}}$ = ${\frac {p}{t}}$ Gravitation Force Earth's Force to pull an object toward the earth Fg = m g = $G{\frac {mM}{R^{2}}}$ Friction Force Force one surface exerts on another surface
Elastic Force Elastic Force of a Spring F = - k x
Electrostatic Force Force of attraction of two stationary Unlike Charge $F_{e}=K{\frac {Q_{+}Q_{-}}{R^{2}}}$ ElectroMotive Force Force causing a stationary charge to move in straigh line $F_{E}=QE$ ElectroMagnetoMotive Force Magnetic Force that cause moving charge to move up or down perpendicular to initial direction of travel $F_{B}=QvB$ ElectroMagnetic Force The sum of Electrostatic Force and ElectroMagneto Force $F_{E}B=F_{E}+F_{B}=Q(E+vB)$ • []