When the force retards the motion of body, the work done is
zero
negative
positive
Positive or negative depending upon the magnitude of force and displacement
Get Answer
When force retards motion i.e., F -(ve) so, work done -(ve)
A man pushes a wall and fails to displace it, he does
negative work
positive but not maximum work
no work at all
maximum positive work
When a man pushes a wall and fails to displace it, then displacement of wall
Work done by man
Therefore, man does no work at all.
A boy carrying a box on his head is walking on a level road from one place to another is doing no work.
This statement is
correct
partly correct
incorrect
cannot say
When a person carrying load on his head moves over a horizontal road, work done against gravitational force is zero.
No work is done if
displacement is zero
force is zero
force and displacement are mutually perpendicular
All of these
If ;If & if .
A particle is taken round a circle by application of force. The work done by the force is
positive non-zero
Zero
negative non-zero
None of these
Displacement of the particle when it takes a complete round the circular path is zero.
Work done force displacement
Therefore, work done by the force is zero.
A porter lifts a heavy suitcase of mass and at the destination lowers it down by a distance of with a constant velocity. Calculate the work done by the porter in lowering the suitcase. (take )
From work-energy theorem,
velocity constant
or,
Consider a force . The work done by this force in moving a particle from point to along the line segment is: (all quantities are in SI units)
Work done,
COLUMN I COLUMN II
(A) Force is always along the velocity (1) W = 0
(B) Force is always perpendicular to velocity (2) W < 0
(C) Force is always perpendicular to acceleration (3) W > 0
(D) The object is stationary but the point of
application of the force moves on the object
(A) (1); (B) (2); (3); (D) (2)
(A) (3); (B) ; (D) (1)
(A) ; (B) ; (D)
(A) ; (D) (1)
A particle moving in the plane undergoes a displacement of while a constant force acts on the particle. The work done by the force is
17 joule
18 joule
16 joule
15 joule
.
A particle describe a horizontal circle of radius with uniform speed. The centripetal force acting is . The work done in describing a semicircle is
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