Advertisements
Advertisements
Question
A ball falls to the ground as shown below :
What is the potential energy of ball at B?
Advertisements
Solution
Total energy of a free falling object remains conserved.
So,
Total energy at A = Total energy at B
So,
(K.E)A + (P.E)A = (K.E)B + (P.E)B
Thus
Total energy at A = (K.E)B + (P.E)B
Therefore,
(P.E)B = (80 – 48) J= 32 J
APPEARS IN
RELATED QUESTIONS
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.
Define the term 'energy' of a body. What is the SI unit of energy.
A ball of mass 0.5 kg slows down from a speed of 5 m/s so that of 3 m/s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.
Water stored in a dam possesses :
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
Write the energy transformations which take place in an electric bulb (or electric lamp).
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
Which of the following energy change involves frictional force?
A body of mass 10 kg falls from a height of 20 m to 8 m. Calculate:
- the loss in potential energy of the body, and
- the total energy possessed by the body at any instant? (Take g = 10 m s-2)
