When a match stick strikes the surface of the matchbox, which form of energy causes it to ignite into a bright flame?

Correct option is B

The correct answer is (b) kinetic energy

Explanation:

• When you rub a matchstick against the striking surface, you are applying a force over a distance, which involves kinetic energy (energy of motion).

• This kinetic energy is converted into thermal energy (heat) due to the friction between the match head and the rough surface of the box.

• The heat generated by this friction is sufficient to reach the ignition temperature of the chemicals present on the matchstick and the striking surface.

• According to NCERT Class 8 Science (Combustion and Flame), the friction converts kinetic energy into heat, which then triggers the chemical reaction required for combustion.

• It is the heat from the kinetic motion that acts as the initial "trigger" or activation energy for the flame.

Information Booster:

• The striking surface of a safety matchbox contains red phosphorus and powdered glass, while the match head contains potassium chlorate and antimony trisulfide.

• The heat from friction converts some red phosphorus into white phosphorus, which reacts with potassium chlorate to produce enough heat to ignite the antimony trisulfide.

Additional Knowledge:

potential energy (Option a)

• This is stored energy based on an object's position or state (like a compressed spring). While the chemicals have "chemical potential energy," the act of striking is the use of kinetic energy to release it.

chemical energy (Option c)

• Chemical energy is the energy stored in the bonds of the chemical compounds (the fuel). While this is what sustains the flame once it starts, it is not the form of energy that causes the initial ignition during the strike.

wind energy (Option d)

• This refers to the kinetic energy of moving air used to turn turbines. In the context of a matchstick, wind is more likely to extinguish a flame rather than cause it to ignite.