Question:
In elastic collision
In elastic collision
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To remember:
- Elastic: Momentum (YES), KE (YES).
- Inelastic: Momentum (YES), KE (NO).
Only the kinetic energy "breaks" in inelastic collisions!
Updated On: May 6, 2026
- both momentum and kinetic energy are conserved
- neither momentum nor kinetic energy is conserved
- only momentum is conserved
- only kinetic energy is conserved
- forces involved in the interaction are non-conservative
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The Correct Option is A
Solution and Explanation
Concept:
Collisions are categorized based on whether kinetic energy is maintained throughout the event.
• Momentum: Momentum is conserved in ALL types of collisions (elastic, inelastic, perfectly inelastic) as long as no external forces act on the system.
• Kinetic Energy (KE): In an elastic collision, there is no permanent deformation or heat generation, so the total KE before the collision equals the total KE after.
Step 1: Evaluate the characteristics of elastic collisions.
By definition, a collision is "elastic" if the total mechanical energy of the system remains unchanged. This implies that the internal forces during the collision are conservative.
Step 2: Identify the conserved quantities.
Since there are no dissipative forces like heat, sound, or permanent shape change involved in a perfectly elastic collision, the kinetic energy of the system is preserved along with the linear momentum. This makes Statement (A) correct.
• Momentum: Momentum is conserved in ALL types of collisions (elastic, inelastic, perfectly inelastic) as long as no external forces act on the system.
• Kinetic Energy (KE): In an elastic collision, there is no permanent deformation or heat generation, so the total KE before the collision equals the total KE after.
Step 1: Evaluate the characteristics of elastic collisions.
By definition, a collision is "elastic" if the total mechanical energy of the system remains unchanged. This implies that the internal forces during the collision are conservative.
Step 2: Identify the conserved quantities.
Since there are no dissipative forces like heat, sound, or permanent shape change involved in a perfectly elastic collision, the kinetic energy of the system is preserved along with the linear momentum. This makes Statement (A) correct.
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