Advertisements
Advertisements
Question
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
Advertisements
Solution
The displacement of the man and suitcase is along the horizontal direction. Thus, the angle between the displacement and the force of gravity is 90°;
Thus, W = Fd cos 90° = 0
Hence, no work is done against gravity in this case.
APPEARS IN
RELATED QUESTIONS
State two conditions when no work is done by a force.
Name the forms of energy which a wound-up watch spring possesses.
Its moment of a force scalar or a vector quantity?
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
A boy does work when he pushes against a brick wall. (yes/no).
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?
