Write definition of work and kinetic energy.

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5.Work, Energy, Power and Collision

easy

Write the definition of work and kinetic energy.

Option A

Option B

Option C

Option D

Solution

Work: The product of magnitude of force and displacement during which the force acts is called work,

$\therefore$ Work $=$ Force $\times$ Displacement

If the force and the displacement are in the same direction, the work done is positive and if they are in opposite direction, the work done is negative and if force is perpendicular the displacement, the work done is zero.

Kinetic energy : Energy is the capacity of doing work.

The energy possessed by a body by virtue of its motion is known as kinetic energy.

Hence, if a body moving with more speed would have more kinetic energy compared to the kinetic energy of the same body moving with comparatively lesser speed.

Another definition of kinetic energy : Half of the product of the mass of a body and the square of its velocity is defined as kinetic energy of the body.

$\therefore$ Kinetic energy $=\frac{1}{2} m v^{2}$

where $m=$ mass of body and $v=$ velocity (or speed) of the body.

Standard 11

Physics

If a lighter body (mass ${M_1}$ and velocity ${V_1}$) and a heavier body (mass ${M_2}$ and velocity ${V_2}$) have the same kinetic energy, then

medium

$A$ ball is projected vertically upwards. Air resistance variation in $g$ may be neglected. The ball rises to its maximum height $H$ in a time $T$, the height being $h$ after a time $t$

$[1]$ The graph of kinetic energy $E_k$ of the ball against height $h$ is shown in figure $1$

$[2]$ The graph of height $h$ against time $t$ is shown in figure $2$

$[3]$ The graph of gravitational energy $E_g$ of the ball against height $h$ is shown in figure $3$

Which of $A, B, C, D, E$ shows the correct answers?

normal

Sand is deposited at a uniform rate of $20\ kg/s$ and with negligible kinetic energy on an empty conveyor belt moving horizontally at a constant speed of $10$ meters per minute. Find the force required to maintain constant velocity of the conveyor belt.

medium

Two bodies of masses $2m$ and $m$ have their K.E. in the ratio $8 : 1$, then their ratio of momenta is

easy

Consider a car moving on a straight road with a speed of $100\, m/s$. The distance at which car can be stopped is …….. $m.$ $[{\mu _k} = 0.5]$

medium

(AIEEE-2005)

Write the definition of work and kinetic energy.

Solution

Similar Questions

If a lighter body (mass ${M_1}$ and velocity ${V_1}$) and a heavier body (mass ${M_2}$ and velocity ${V_2}$) have the same kinetic energy, then

Sand is deposited at a uniform rate of $20\ kg/s$ and with negligible kinetic energy on an empty conveyor belt moving horizontally at a constant speed of $10$ meters per minute. Find the force required to maintain constant velocity of the conveyor belt.

Two bodies of masses $2m$ and $m$ have their K.E. in the ratio $8 : 1$, then their ratio of momenta is

Consider a car moving on a straight road with a speed of $100\, m/s$. The distance at which car can be stopped is …….. $m.$ $[{\mu _k} = 0.5]$

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