Advertisements
Advertisements
प्रश्न
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
Advertisements
उत्तर
- An object's acceleration could be zero even when several forces are acting on it. This happens when all the forces cancel out each other, i.e., the net force acting on the object is zero.
- For a uniformly moving object, the net force acting on the object is zero.
- Hence, the acceleration of the object is zero. Hence, Soni is right.
- Then, according to the equation F = ma, the mass of the object.
- Acceleration = `F/m` (since F = 0) will also be zero.)
APPEARS IN
संबंधित प्रश्न
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Work is said to be done by a forte only when ................
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
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?
