Advertisements
Advertisements
Question
Write the expression for the gravitational potential energy explaining the meaning of the symbols used.
Solution
Expression for the gravitational potential energy: P.E. = U = mgh
Where U is gravitational potential energy m is the mass of the body.
g is force of gravity on the mass of 1 kg
mg is the force acting on body
h is the distance or height moved above the ground level.
APPEARS IN
RELATED QUESTIONS
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.
A bucket full of water is on the first floor of your house and another identical bucket with the same quantity of water is kept on the second floor. Which of the two has greater potential energy?
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 potential energy stored in the body.
Two bodies of same masses are placed at heights h and 2h. Compare their gravitational potential energy.
A ball of mass m is thrown vertically up with an initial velocity so as to reach a height h. The correct statement is:
A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
potential energy acquired by the weights.
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
A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s2).
A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car :
Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy.