Advertisements
Advertisements
Question
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Advertisements
Solution
The work done against gravity is zero when a body is moved horizontally along a frictionless surface because the force of gravity is perpendicular to the displacement in this case.
RELATED QUESTIONS
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
What is the work done by the moon when it revolves around the earth?
A box of weight 150 kgf has gravitational potential energy stored in it equal to 14700 J. Find the height of the box above the ground. (Take g = 9.8 N kg-1)
Explain degradation of energy by taking two examples of your daily life.
A uniform circular motion is an accelerated motion. Justify it.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
Define Translational motion.
Can two agents, doing the same work, have different power?
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?
