In which of the following situations is no work done?

A boy pulls the bands of a catapult

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A man climbs up a ladder

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A box slides on a smooth floor

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A flower vase falls from a balcony onto the ground below

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Solution

The correct option is C A box slides on a smooth floor
Work done is defined by: $w = F \times$ displacement where F is force applied.
On smooth floor frictional force is zero,therefore work done is zero.

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Similar questions

In a children's park, there is a slide which has a total length of 10 m and a height of St m (figure 8-E3). Vertical ladder are provided to reach the top. A boy weighing 200 N climbs up the ladder to the top of the slide and slides down to the ground. The average friction offered by the slide is three tenth of his weight. (a) the work done by the boy on the ladder as he go: up, (b) the work done by the slide on the boy as he cornea down, (c) the work done by the ladder on the boy as he goes up. Neglect any work done by forces inside the body of the boy.

Q. A man with a box on his head is climbing up a ladder. The work done by the man on the box is

Q. In a children's park, there is a slide which has a total length of 10 m and a height of 8⋅0 m (figure 8-E3). A vertical ladder is provided to reach the top. A boy weighing 200 N climbs up the ladder to the top of the slide and slides down to the ground. The average friction offered by the slide is three tenth of his weight. Find (a) the work done by the ladder on the boy as he goes up; (b) the work done by the slide on the boy as he comes down. Neglect any work done by forces inside the body of the boy.
Figure

Q. A man with a box on his head is climbing up a ladder. What work is said to be done by the man on the box?

State whether work is done or not by writing yes or no, in the following cases:

(a) A man pushes a wall.

(b) A coolie stands with a box on his head for 15 min.

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In which of the following situations is no work done?

The correct option is C A box slides on a smooth floorWork done is defined by:w=F×displacement where F is force applied.On smooth floor frictional force is zero,therefore work done is zero.

The correct option is C A box slides on a smooth floor
Work done is defined by: $w = F \times$ displacement where F is force applied.
On smooth floor frictional force is zero,therefore work done is zero.