Chapter 7
Work, Energy, and Simple Machines
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

For each of the following situations, identify the energy transformation that takes place:

(A) a truck moving uphill

(B) unwinding of a watch spring

(C) photosynthesis in green leaves

(D) water flowing from a dam

(E) burning of a matchstick

(F) explosion of a fire cracker

(G) speaking into a microphone

(H) a glowing electric bulb

(I) a solar panel.

Answer: Verified

(A) Chemical energy → Mechanical energy → Potential energy

(B) Potential energy → Mechanical energy

(C) Light energy → Chemical energy

(D) Potential energy → Kinetic energy

(E) Chemical energy → Heat energy and light energy

(F) Chemical energy → Heat energy, light energy and sound energy

(G) Sound energy → Electrical energy

(H) Electrical energy → Light energy and heat energy

(I) Light energy → Electrical energy

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(All Q's of this Chapter solved)
More NCERT Questions
Explain why roads on hills are built to wind around in gentle slopes rather than going straight up? [Pg. No. 132] Why is it easier to open the lid of a can by using a spoon as shown in Figure.[Pg. No. 135] To reach a higher floor, we find climbing an inclined ladder easier in comparison to climbing a vertical ladder. Explain why.[Pg. No. 132] State whether True or False. (A) Work is said to be done when a force is applied, even if the object does not move. (B) Lifting a bucket vertically upward results in positive work done on the bucket.