Question

III. Fill in the blanks.
1. When force and displacement are in perpendicular
directions, the work is .......
2. The unit of work in terms of newton and metre is
3. A force of 20 N acts on an object, which is displaced
by 2 m. The direction of the displacement is not
known. The maximum and minimum amounts of
work possible are respectively ....... and .......
4. The sum of kinetic energy and potential energy is
called .......
5. When an object is thrown up, its potential energy
...... and its kinetic energy ...... till it reaches the
highest point.
6. When an object is dropped from a height, its
potential energy ...... and its kinetic energy ...... till it
reaches the ground.
7. A compressed spring has ...... potential energy than
the potential energy which it has at the natural
length
8. When a torch is switched on, the ...... energy of the
batteries is converted into heat and light.​

Answer 1

Answer:

1 zero

4 mechanical energy

5 increases ,decreases

6decreases , increases

Explanation:

Answer 2

Answer:

1. zero

2. Nm ( newton metre)

3. 40J and 0J

4. mechanical energy

5. increases and decreases

6. decreases or increases

7. greater

8. chemical energy