We hear the term

When we talk about energy in physics we're basically refering to the

We'll derive the formula for the kinetic energy. From the kinematics we know,

$$v^{2}=u^{2}+2ad$$

and from Newtons second law

$$F=ma$$

If we start an object at rest then the initial velocity is zero (i.e. $u=0$). Then from the definition of work,

\begin{align*} W&=F\times d\\ &=m\times a\times d\\ &=m\times \frac{v^{2}}{2d}\times d \\ &=\frac{1}{2}mv^{2}\end{align*}

Thus,

$$W=E=\frac{1}{2}mv^{2}$$

$Ex.$ An object of mass $4kg$ is moving at a speed of $30ms^{-1}$. Calculate the Kinetic energy of an object?

$sol^{n}$=1800$J$

*"Energy"*a lot in physics. Here we'll discuss about the notion about energy.When we talk about energy in physics we're basically refering to the

*"capacity for doing work."*It is a scalar quantity. One of the important concept related to the energy is the*"Law of conservation of energy."***Law of conservation of energy:**"It states for an isolated system,*the total***energy**remains constant—it is said to be conserved over time.**Energy**can neither be created nor destroyed; rather, it transforms from one form to another."*Some form energy that we know are,**Mechanical energy, Chemical energy, Electrical energy, Nuclear energy, Radiation energy, Sound energy, Internal and Thermal energy. (click here)*

We'll derive the formula for the kinetic energy. From the kinematics we know,

$$v^{2}=u^{2}+2ad$$

and from Newtons second law

$$F=ma$$

If we start an object at rest then the initial velocity is zero (i.e. $u=0$). Then from the definition of work,

\begin{align*} W&=F\times d\\ &=m\times a\times d\\ &=m\times \frac{v^{2}}{2d}\times d \\ &=\frac{1}{2}mv^{2}\end{align*}

Thus,

$$W=E=\frac{1}{2}mv^{2}$$

$Ex.$ An object of mass $4kg$ is moving at a speed of $30ms^{-1}$. Calculate the Kinetic energy of an object?

$sol^{n}$=1800$J$

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