Conservation of Momentum Report https://www.youtube.com/watch?v=bZ6LVSDqc_Y&feat

Question

Conservation of Momentum Report

https://www.youtube.com/watch?v=bZ6LVSDqc_Y&feature=youtu.be

Mass of Cart 1

Mass of Cart 2

Mass of Bar 1

Mass of Bar 2

The video on top should help with the chart

M1(kg)

M2(kg)

V10(m/s)

V20(m/s)

VF(m/s)

P0(kgm/s)

PF(kgm/s)

%Diff.

KE0(J)

KEF(J)

%Loss

[Note: M1 is the mass of cart 1 plus the mass of any bars on it; M2 is always just the mass of the empty cart 2.]

1.The principle of conservation of mass/energy states that mass/energy is neither created nor destroyed. If the Kinetic energy in these cases is not destroyed what happens to it?

What do you think is the largest source of error in this experiment and why?

Does it bother you that the momentum, which depends on mass and velocity’ can be conserved and the kinetic energy, which also depends on mass and velocity, can be lost to the system? Why or why not?

Mass of Cart 1

Mass of Cart 2

Mass of Bar 1

Mass of Bar 2

Explanation / Answer

1.The principle of conservation of mass/energy states that mass/energy is neither created nor destroyed. If the Kinetic energy in these cases is not destroyed what happens to it?

Energy can neither be created nor destroyed is true for any process . The case we are discussing in the experiment is perfectly inelastic collision .In this case the bodies undergoing collision sticks together after the collision resulting in a loss of energy due to permanent deformation of the bodies at the microscopic level or in form of heat , sound , light . Thus ,part of the initial kinetic energy is released into the surrounding , if we take that energy into account then we get the picture of how the energy conservation still holds for ( surrounding + system ). But when we talk only about the system undergoing collisiion then kinetic engery is not conserved for that system .

Does it bother you that the momentum, which depends on mass and velocity’ can be conserved and the kinetic energy, which also depends on mass and velocity, can be lost to the system? Why or why not?

Now , lets talk about momentum of the system , in the experiment we see that there is no net external force acting on the system in the horizontal direction . Thus, from the momentum conservation law we can say that the momentum of the system must be conserved in the horizontal direction . However the loss of energy is related to the kind of collision (perfectly inelastic), but momentum is conserved for all kinds of collisions .

Hope it clears your doubts. :)

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