Question

what is force


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Answer 1

In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.

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Answer 2

$\ \ \ \ \ \huge \mathfrak{ \pmb{ \colorbox{lavender}{ \: \: \: \: \: \: \red F \: \blue O \: \green R \: \purple C \: \orange E \: \ \ \ \ \: }}}$

Force is push or pull acting on a body which tends to change its state of rest or of motion. It is denoted by "F". It has a magnitude and a direction.

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$\large \red{\bold{Formula \ for \ Force \: : - } } \\ \\ \huge\underline{\boxed{\textrm{F = {\texttt{ma}}}}}$

Here,

• " m " = Mass of the body
• " a " = Acceleration
• " F " = Force

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Derivation of Force [ F = ma ] using Newton's law of motion.

$\begin{gathered} \begin{gathered}\small{\bold{Newton's\:Second\:Law \ states \ that \ :-}}\\ \tiny \: \tt \: The \: rate \: of change \: of \: momentum \: of \: an \: object \\ \tiny \tt depends \: upon \: the \: direction \: and \: magnitude \: of \: applied \: force.\end{gathered} \end{gathered}$

$\blue{\large{\bf{F \propto \cfrac{dp}{dt}}} }\\ \\ \blue{\large{ \ \bf{F \propto \cfrac{d(mv - mu)}{dt}}} } \\ \\ \blue{\large{ \ \bf{F = k.m \cfrac{d(v - u)}{dt}}} } \\ \\ \blue{\large{\ \bf{F = k.ma}} \quad \quad \tt{[If, k = 1]}} \\ \\ \blue{\large{\leadsto \underline{\boxed{\bf{ \pmb{F = ma}}}}}}$

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Unit of Force :-

• SI unit of force is Newton(N).
• C.G.S (centimetre gram second) unit of force is Dyne.

Effects of force -

• Force can change the direction of a moving object.
• Force can change the shape and size of an object.
• Force can change the speed of a moving object.
• Force can change a body′s state of motion or rest.

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