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# Thread: This Physics Question f'ing Blows!

1. ## This Physics Question f'ing Blows!

1A. Which of the curves labeled A to D on the graph (Part A figure) could be a plot of v_x(t), the velocity of the object in the x direction as a function of time?

1B. Which of the curves labeled A to D on the graph (Part B figure) could be a plot of x(t), the position of the object along the x axis as a function of time?

EDIT: First Part:

Two forces are exerted on an object of mass m in the x direction as illustrated in the free-body diagram. (Intro 1 figure) Assume that these are the only forces acting on the object.

2. Halp!

3. the answer is 42

4. C
D

5. A
B

6. we need the preamble first, not just the graphs

7. edit: need more info

8. first one is D.

i think the second one is A.

im tired.

9. posted first part

10. B for velocity
D for position

If those forces are constantly applied, velocity will decrease linearly and position will be parabolic. I think this is right. Not sure why the position graph goes up at first.

11. The two forces can be added together, so the net force will be to the left. This means there is a constant acceleration to the left. This implies a linear velocity (with a negative slope) and a quadratic position, also with a negative derivative. The two lines which represent this are B and D.

12. i think its
B
D
velocity is the derivative of position. you know that if velocity is a -x then the position has to be -x^2/2 which would make it D for the position.

13. Originally Posted by dealmaster
The two forces can be added together, so the net force will be to the left. This means there is a constant acceleration to the left. This implies a linear velocity (with a negative slope) and a quadratic position, also with a negative derivative. The two lines which represent this are B and D.
this r correct.

14. A
A

15. Originally Posted by astarr22
B for velocity
D for position

If those forces are constantly applied, velocity will decrease linearly and position will be parabolic. I think this is right. Not sure why the position graph goes up at first.
you're right for the first one. i didnt think about the axes.
for the second one, you're probably right, i noticed that too.

16. Acdc

17. the forces are unbalanced and unchanging in negative direction, therefore constant negative acceleration so it has to be B for 1A. Since it's negative acceleration -> D for 1B

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