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 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?
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
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.
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Name the physical quantity whose MKS units are kgm2s-3.
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
A is a push or a pull ______.
A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.
