PHYS 121 Lecture Notes - Lecture 13: Momentum, Inelastic Collision, Internal Energy

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cerisechimpanzee65

7 May 2019

School

Department

Physics

Course

PHYS 121

Professor

Gerald T.Seidler

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Document Summary

All diagrams taken from "l13_conservation_of_energy. pdf" on the course canvas website. B, if magnitude is the same and directions are opposite. Kinetic energy is a positive scalar, only zero for a stationary object. If v doubles, the magnitude of momentum doubles, kinetic energy quadruples. If the kinetic energy added is a momentum of the same magnitude and in an opposite direction. Internal energy: the state of a system is the condition of an object, the transformation of a system from one state to another is a process, reversible and irreversible. Internal energy is energy associated with the state of an object: thermal, elastic, electromagnetic/radiation, chemical, nuclear. In an inelastic collision, one or the other object undergoes a change in internal state, which takes up some kinetic energy (momentum is still conserved) Quiz: a small bullet is fired into a large piece of wood.

Related Questions

In a perfectly inelastic one-dimensional collision between two moving objects, what condition alone is necessary so that the final kinetic energy of the system is zero after the collision? (a) The objects must have initial momenta with the same magnitude but opposite directions, (b) The objects must have the same mass. (c) The objects must have the same initial velocity. (d) The objects must have the same initial speed, with velocity vectors in opposite directions.

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In a perfectly inelastic one-dimensional collision between two moving objects, what condition alone is necessary so that the final kinetic energy of the system is zero after the collision?

(a) The objects must have initial momenta with the same magnitude but opposite directions.

(b) The objects must have the same mass.

(d) The objects must have the same initial speed, with velocity vectors in opposite direction.

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1. Can work be done on a system if there is no motion?

A) Yes, if an outside force is provided B) Yes, since motion is only relative C) No, since a system which is not moving has no energy D) No, because of the way work is defined

2. The quantity 1/2 mv 2 is

A) the power supplied to the object by the force B) the work done on the object by the force C) the kinetic energy of the object. D) the potential energy of the object.

3. If you push twice as hard against a stationary brick wall, the amount of work you do

A) doubles. B) is cut in half C) remains constant but non-zero D) remains constant at zero

4. If the net work done on an object is positive, then the object's kinetic energy

A) increases. B) decreases C) remains the same D) is zero

5 A force of 20 N moves an object in the direction of the force. The work done when the object moves from 2.0 to 4.0 m is o A) 20 J OB) 40 J oC) 60 J D) 80 J

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PHYS 121 Lecture Notes - Lecture 13: Momentum, Inelastic Collision, Internal Energy

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