PHYS 193 Fall 2017 Final Exam (2) If you don\'t indicate the units when appropri

Question

PHYS 193 Fall 2017 Final Exam (2) If you don't indicate the units when appropriate you will lose points. 8. Use the following results of the "Acceleration/velocity" experiment to f fill out the table below 1.5 0.5 05 0.5 From Until When is the object moving in the negative direction? When is the object accelerating in the negative direction? When is the object moving in the positive direction? When is the object accelerating in the positive direction? When does this object change direction of its motion? What is the velocity of the object at that moment? What is the acceleration of the object at that moment? When is the velocity of this object the largest and positive? What is the magnitude of the largest positive velocity of the object? 12 10 2. 0 0.5 1.5ame (s) 2 2.5

Explanation / Answer

moving in negative direction->

when velocity is negaticve

0.7s to 1.6 sec

acceleration in negative direction:

slope of v vs t curve is negative.

0.7s to 1 sec

And 2.5 to 2.9 sec  

moving in positive direction:

v is above x axis:

1.6 sec to 2.9 sec  

Acceleration in +ve direction:

slope positive.

1 sec to 2.5 sec  

CHange its direction of motion:

at 1.6 sec

at that time velocity is zero.

acceleration = slope = (1 + 0.75) / (2.4 - 1.1)

= 1.35 m/s^2

v_largest = 1 m/s

magnitude will be also 1 m/s.

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