Q. 74.3( 20 Votes )
State if each of the following statements is true or false. Give reasons for your answer.
A. In an elastic collision of two bodies, the momentum and energy of each body is conserved.
B. Total energy of a system is always conserved, no matter what internal and external forces on the body are present.
C. Work done in the motion of a body over a closed loop is zero for every force in nature.
D. In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.
Answer :
A. False
Explanation: In an elastic collision, the energy and momentum of the entire system is conserved and not of individual bodies.
B. False
Explanation: External forces can do work on the system and hence, they can change the total energy of the system.
C. False
Explanation: Work done in the motion of a body over a closed loop is zero only for conservative forces.
D. True
Explanation: In inelastic collisions, the final kinetic energy is always less than the initial kinetic energy because some of the energy is lost during the process in the form of sound, heat, etc.
Rate this question :
How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
PREVIOUSUnderline 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.NEXTAnswer carefully, with reasons:A. In an elastic collision of two billiard balls, is the total kinetic energy conserved during the short time of collision of the balls (i.e. when they are in contact)?B. Is the total linear momentum conserved during the short time of an elastic collision of two balls?C. What are the answers to (a) and (b) for an inelastic collision?D. the potential energy of two billiard balls depends only on the separation distance between their centres, is the collision elastic or inelastic? (Note, we are talking here of potential energy corresponding to the force during collision, not gravitational potential energy).
Related Videos
Inelastic collisions in 1 D44 mins
Check Your progress Part 2| Interactive Quiz: Work, Energy & Power44 mins
Complete Revision of Work , Power and Energy | Mastering important chapters46 mins
Work, Energy & Power (Lecture 6)41 mins
Work, Energy & Power (Lecture 4)50 mins
Work, Energy & Power (Lecture 5)54 mins
Interactive Quiz of Work Power energy | Check your progress53 mins
Conservation of Linear Momentum, Visualize the concept (Theory + Interactive Quiz)41 mins
Work, Energy & Power (Lecture 7)48 mins
Check Your progress, final test| Interactive Quiz: Work, Energy & Power50 mins




















Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
view all courses
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation


RELATED QUESTIONS :
During inelastic collision between two bodies, which of the following quantities always remain conserved?
Physics - Exemplar