Advertisements
Advertisements
प्रश्न
A body of mass m is moved from ground to a height h. If the force of gravity on mass of 1 kg is g newton, find the force needed to lift the body.
Advertisements
उत्तर
When a body of mass m at A on the ground is raised above ground through height h at B force is applied. This force applied = weight of body
Force on mass m = F = m g
Where ‘g’ is the force of gravity on a mass of 1 kg.
APPEARS IN
संबंधित प्रश्न
A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.
State two factors on which the potential energy of a body at a certain height above the ground depends.
Write the expression for the gravitational potential energy explaining the meaning of the symbols used.
A body at a height possesses ______.
Two bodies A and B of equal masses are kept at heights of h and 2h respectively. What will be the ratio of their potential energies?
State whether the following statement is true or false :
The potential energy of a body of mass 1 kg kept at a height of 1 m is 1 J.
What is the difference between gravitational potential energy and elastic potential energy? Give one example of a body having gravitational potential energy and another having elastic potential energy.
A man is instructed to carry a package from the base camp at B to summit A of a hill at a height of 1200 metres. The man weighs 800 N and the package weighs 200 N. If g = 10 m/s2,
- how much work does man do against gravity?
- what is the potential energy of the package at A if its is assumed to be zero at B?
Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy.
A body is falling from a height of h. After it has fallen a height `"h"/2`, it will possess
