## (Answered)-hey! I have a question in how to approach the momentum charts !

hey! I have a question in how to approach the momentum charts !?

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Physics 7B Section C

Quiz #3

5/14/2014

Student ID

1.

Last Name

First Name

____

DL Section/TA

f

First 3 Letters of Last Name

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____

____

r

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r cos?

r sin ?

KE =

1 2

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2

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A teacup with a mass of 360g is accidentally dropped straight down to a hard floor, and upon impact it breaks into three

pieces, which have masses of 60g, 100g, and 200g, all of which scatter horizontally (they don?t bounce upward) from the

point of impact. After a very short time, the 60g piece is 1.0m due east from the point of impact, and the 100g piece is

0.8m north of the point of impact. [Assume that all the pieces originate from the point of impact, and that the friction

force by the floor on the pieces of the cup is negligible.]

a.

Fill-in the momentum charts below for each of the three components of the momentum of the cup system using the

initial time of just before impact with the floor, and the final time of ?a very short time? later, as indicated above.

Use the compass directions shown in the formula bar above for the north-south and east-west charts.

b.

Explain how you are able to determine relative scales of momentum for the three pieces from the information you

have been given (you should have attempted to reflect these relative scales in your charts above).

c.

Use your momentum charts to find the distance of the 200g piece from the point of impact at the same final time

indicated above, and the direction this piece is moving, measured in degrees as a counter-clockwise angle from due

north.?

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2.

Three forces act on a 4.0kg object in different directions in the horizontal plane for a period of time of 8.0s. A force

diagram (top view) for this object is provided below (the arrows are not drawn to scale). During this time, the object

moves at a constant speed of 3.5m/s to the right (its direction of motion is aligned with the direction of the force vector

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 F3 ). The force vector  F1 has a magnitude of 12.0N, and the angles are as marked in the diagram. Find the magnitudes

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of the force vectors  F2 and  F3 . Show all your work.

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F1

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F3

45?

60?

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F2

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