Advertisements
Advertisements
प्रश्न
When an object falls freely towards the earth, then its total energy :
विकल्प
increases
decreases
remains constant
first increases and then decreases
Advertisements
उत्तर
Total energy of a freely falling object remains conserved.
Therefore the answer is, (c) Remains constant
APPEARS IN
संबंधित प्रश्न
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
What type of energy is possessed : by the stretched rubber strings of a catapult?
Give two examples where a body possesses both, kinetic energy as well as potential energy.
Define the term 'energy' of a body. What is the SI unit of energy.
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Name the device or machine which convert :
Electrical energy into light energy.
A bulb lights up when connected to a battery. State the energy change which takes place :
A ball falls to the ground as shown below :
Which law you have made use of in answering this question?
Which of the following energy change involves frictional force?
