For each of the following situations, identify the energy transformation that takes place. Class 9

For each of the following situations, identify the energy transformation that takes place. Class 9

Question 1.

For each of the following situations, identify the energy transformation that takes place: Class 9

(i) a truck moving uphill,

(ii) unwinding of a watch spring,

(iii) photosynthesis in green leaves,

(iv) water flowing from a dam,

(v) burning of a matchstick,

(vi) explosion of a fire cracker,

(vii) speaking into a microphone,

(viii) a glowing electric bulb, and

(ix) a solar panel.

Answer:

(i) Truck moving uphill: Chemical energy (fuel) → Kinetic energy + Potential energy (+ heat energy due to friction)

(ii) Unwinding of a watch spring: Elastic potential energy → Kinetic energy

(iii) Photosynthesis in green leaves: Light energy → Chemical energy

(iv) Water flowing from a dam: Potential energy → Kinetic energy (→ Electrical energy in power plants)

(v) Burning of a matchstick: Chemical energy → Heat and light energy

(vi) Explosion of a firecracker: Chemical energy → Heat, light, sound and kinetic energy.

(vii) Speaking into a microphone: Sound energy → Electrical energy

(viii) A glowing electric bulb: Electrical energy → Light and heat energy

(ix) A solar panel: Light energy → Electrical energy