Which of the following statements about momentum and kinetic energy in a collision is TRUE?
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Momentum and kinetic energy are both conserved in an elastic collision; but neither are conserved in an inelastic collision.
Kinetic energy is always conserved in any collision, but momentum is only conserved in an elastic collsion.
Kinetic energy is always conserved in any collision, but momentum is only conserved in an inelastic collision
Momentum and kinetic energy are both always conserved in any collision
Your Answer
Momentum is always conserved in any collsion, but kinetic energy is only conserved in an inelastic collision.
Momentum is always conserved in any collision, but kinetic energy is only conserved in an elastic colision.
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Question 3
(1 points)
Complete the following sentence with the best selection of word(s) choices below:
” In an elastic collision, if two objects were initially moving towards each other at a particular rate, then after they collide they will be moving apart from each other at that same rate.” . This statement is most accurately described as a direct interpretation of _ (i) _ .
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the principle of conservation of energy
the relative velocity equation
the generalized work-energy theorem
the impulse-momentum theorem
the principle of conservation of momentum
the principle of independence of orthogonal motion
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Question 4
(1 points)
Which of the following statements about center of mass are true?
(i) an isolated object, if set in rotation, will rotate about its center of mass.
(ii) for an object of uniform material, the center of mass will be at its geometric center.
(iii) the center of mass of an object is the point at which the mass is symmetrically distributed in any dimension.
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Only statements (ii) and (iii) are true
Only statements (i) and (ii) are true
All of the statements are true
Only statement (ii) is true
Only statement (i) is true
Only statements (i) and (iii) are true