In two different situations, a constant force is applied to a moving object; the

Question

In two different situations, a constant force is applied to a moving object; the free body diagrams (FBD) for each case are shown below. The velocity vectors next to the FBDs correspond to the object's initial velocity, vo- Sketch a-t, vt, and x- graphs for eaclh case. (The positive x axis points to the right.) (2) F Consider the following graphs (in two diagrams only for clarity. t (5) t (5) i. Which curve(s) could describe position vs. time for FBD 1? ii. Which curve could describe velocity vs. time for FBD 1? iii. Which curve could describe acceleration vs. time for FBD 2? iv. Which curve(s) could describe position vs. time for FBD 2? For your answer, choose any of the curves from either diagram; e.g., enter ABCHI. If more than one curve applies to a question, enter the labels in alphabetical order. If none of the curves applies, enter N.

Explanation / Answer

i) A,H

as already moving in positive direction and F only accelerates it, making the displacement rise exponentially

ii) I

as non zero velocity which later increases uniformly due to F

iii) D

negative acceleration

iv) C, J

as goes forward for a while and then reverses due to negative acceleration

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