EASY
9th CBSE
IMPORTANT
Earn 100

Give one example where mechanical energy changes into heat energy.

Important Questions on Work and Energy

EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 1

 Give one example where potential energy changes into electrical energy.

EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 1

Give one example where electrical energy changes into potential energy.

EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 2
What do you understand by the term energy transformation? Support your answer by an example.
 
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 3
State the law of conservation of energy.
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 4
A nail becomes warm when hammered into a plank. Explain, why ?
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 5
 A torch cell converts one form of energy into another. Name the two forms of energy.
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 6
What kind of energy transformations take place at a thermal power station?
EASY
9th CBSE
IMPORTANT
Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 7
Why does a saw become warm, when it is used to cut a log of wood? State the energy transformations taking place in the process.