A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that

(1) Its velocity is constant

(2) Its acceleration is constant

(3) Its kinetic energy is constant

(4) It moves in a straight line

Concept Questions :-

Concept of work

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A force $\overrightarrow{F}=(5\hat{i}+3\hat{j}+2\hat{k})N$ is applied over a particle which displaces it from its origin to the point $\overrightarrow{r}=(2\hat{i}-\hat{j})m$. The work done on the particle in joules is

(1) – 7

(2) +7

(3) +10

(4) +13

Concept Questions :-

Concept of work

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It is easier to draw up a wooden block along an inclined plane than to haul it vertically, principally because

(1) The friction is reduced

(2) The mass becomes smaller

(3) Only a part of the weight has to be overcome

(4) ‘*g*’ becomes smaller

PMT - 1977

Concept Questions :-

Concept of work

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Two bodies of masses 1 *kg *and 5 *kg* are dropped gently from the top of a tower. At a point 20 *cm* from the ground, both the bodies will have the same** **

(1) Momentum

(2) Kinetic energy

(3) Velocity

(4) Total energy

Concept Questions :-

Concept of work

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A particle moves under the effect of a force *F* = *Cx* from *x *= 0 to *x* = *x*_{1}. The work done in the process is

(1) $C{x}_{1}^{2}$

(2) $\frac{1}{2}C{x}_{1}^{2}$

(3) $C{x}_{1}$

(4) Zero

PMT - 1982

Concept Questions :-

Work done by variable force

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A cord is used to lower vertically a block of mass *M* by a distance *d* with constant downward acceleration $\frac{g}{4}$. Work done by the cord on the block is** **

(1) $Mg\frac{d}{4}$

(2) $3Mg\frac{d}{4}$

(3) $-3Mg\frac{d}{4}$

(4) *Mgd *

PMT - 1972

Concept Questions :-

Gravitational Potential energy

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Two springs have their force constant as *k*_{1} and ${k}_{2}({k}_{1}>{k}_{2})$. When they are stretched by the same force** **

(1) No work is done in case of both the springs

(2) Equal work is done in case of both the springs

(3) More work is done in case of second spring

(4) More work is done in case of first spring

Concept Questions :-

Elastic potential energy

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The potential energy of a certain spring when stretched through a distance ‘*S*’ is 10 *joule*. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance ‘*S*’ will be:

(1) 30

(2) 40

(3) 10

(4) 20

PMT - 2002

Concept Questions :-

Elastic potential energy

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A position dependent force $F=7-2x+3{x}^{2}\text{\hspace{0.17em}}newton$ acts on a small body of mass 2 *kg* and displaces it from *x* = 0 to *x* = 5 *m*. The work done in *joules* is:

(1) 70

(2) 270

(3) 35

(4) 135

PMT - 1994

Concept Questions :-

Work done by variable force

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A body of mass 3 *kg* is under a force, which causes a displacement in it, given by $S=\frac{{t}^{3}}{3}$ (in *m*). Find the work done by the force in first 2 seconds:** **

(1) 2 *J*

(2) 3.8 *J*

(3) 5.2 *J*

(4) 24 *J*

Concept Questions :-

Work done by variable force

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