Advertisements
Advertisements
Question
Two bodies A and B of masses 10 kg and 20 kg respectively are at the same height above the ground. Which of the two has greater potential energy?
Advertisements
Solution
Body A Body B
P.`E_1`=`m_1`gh P.`E_2`=`m_2`gh
P.`E_1`=10×gh P.`E_2`=20 ×gh
As g is constant and h is the same in both the cases
Pe2 is greater than PE.
Hence, Potential energy of body B (more mass) is greater than the P.E. of body A.
Or
As the height of body A and is same and ‘g’ is constant, the body with greater mass i.e. body B has greater potential energy.
APPEARS IN
RELATED QUESTIONS
The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
Gravitational potential energy U = mass × force of gravity on unit mass × ..........
State two factors on which the potential energy of a body at a certain height above the ground depends.
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.
A body of mass m is moved from ground to a height h. If force of gravity on mass of 1 kg is g newton, find the work done in lifting the body.
Define the term potential energy of a body.
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?
A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
work done by the weightlifter
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 body is falling from a height of h. After it has fallen a height `"h"/2`, it will possess
