A bucket of water tied to a rope is being pulled up from a well as shown in the figure below (fig 1). Name the two forces acting on the bucket in the upward and downward directions. Also mention whether these forces are contact or non-contact forces by nature.
Answers
Answer:
Answer
Work done is considered positive when the displacement is in the same direction as that of the applied force and negative when the displacement is in the opposite direction of applied force.
(a)Positive
In the given case, force and displacement are in the same direction. Hence, the sign of work done is positive. In this case, the work is done on the bucket.
(b) Negative
In the given case, the direction of force (vertically downward) and displacement (vertically upward) are opposite to each other. Hence, the sign of work done is negative.
(c) As force and displacement are in opposite directions, work done is negative.
(d) As force and displacement are in the same direction, work done is positive.
(e) As force and displacement are in opposite directions, work done is negative.
Gravitational force (downward) and tension are the two factors influencing the bucket (upward).
Explanation
- There is an attraction between the earth and the item due to the gravitational force, which affects all things and bodies. This force operates downward and is by nature non-contact.
- The tension force develops when the rope is pulled. A rope may resist compression but not tension thanks to a particular property. Rope use is made possible by this resistance to tension. The direction of this force is upward along the rope and it is a contact force.
Hence Gravitational force (downward) and tension are the two factors influencing the bucket (upward).
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