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Q5.6: NCERT Physics - Part 1 WORK, ENERGY AND POWER 5.6 Solution: Underline the correct alternative: (a) When a conservative…
Underline the correct alternative: (a) When a conservative force does positive work on a body, the potential energy of the body increases/decreases/remains unaltered. (b) Work done by a body against friction always results in a loss of its kinetic/potential energy. (c) The rate of change of total momentum of a many-particle system is proportional to the external force/sum of the internal forces on the system. (d) In an inelastic collision of two bodies, the quantities which do not change after the collision are the total kinetic energy/total linear momentum/total energy of the system of two bodies.
Step-by-Step Verified Solution
**Answer:** (a) decreases (b) kinetic (c) external force (d) total linear momentum
**Step-by-Step Explanation:**
(a) When a conservative force does positive work, potential energy decreases (F = -dU/dx).
(b) Friction opposes motion, converting kinetic energy into heat.
(c) By Newton's second law for a system, the rate of change of total momentum equals the external force.
(d) In an inelastic collision, total linear momentum is conserved. Kinetic energy is not conserved.
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