Advertisements
Advertisements
Question
When a body falls freely towards the earth, then its total energy
Options
increases
decreases
remains constant
first increases and then decreases
Solution
remains constant
Explanation:
When a body falls freely towards the earth, its potential energy decreases which in turn increases the kinetic energy. Therefore, its total energy remains constant.
APPEARS IN
RELATED QUESTIONS
Match the following columns
| COLUMN A | COLUMN B |
| 1. Running water | 1. heat energy |
| 2. Burning | 2. vibrations |
| 3.Energy | 3.atom bomb |
| 4.Sound energy | 4.kinetic energy |
| 5.Nuclear energy | 5.joule |
Select the correct alternatives
When a bulb lights up on passing current, the change of energy is
Define the term efficiency of a machine.
Give a reason for the following.
The efficiency of a machine is always less than 100%.
Define the term 'watt'.
How many joules are there in one kilowatt-hour?
What is the common name of '1 kWh' of electrical energy?
The commercial unit of energy is :
We make useful objects from a variety of substances. Another use of substances is that we get energy from some of them.
There is a car. Its tank is full of fuel but it does not move. Why is that?
The weight of a person on planet A is about half that on the earth. He can jump up to 0.4 m in height on the surface of the earth. How high he can jump on planet A?
