Tbr physics chapter 1 question 16

[Godric]

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Physics time!

Q: for experiment 2, what might account for the different time and different distances measured?

A. The init v in each case is differ
B. the a in each case is differ
C. Both a and b
D. Neither a nor b

The relevant info for experiment 2 is that the angle is kept the same and a air cart with with the same mass goes up and down the track and the times are measured for going up and down and your also given the distance.

I choose C because I thought varying either the a or v would effect the distance and time, but the answer says its A because the angle is the same and all differences can be attributed to differ init V.

I don't understand how the angle
dictates constant acceleration.

 

[milski]

Just guessing without the book, but consider the forces acting on each cart. Since the masses are the same, the forces are what is going to determine any difference in acceleration. If they are propelled by the same force (if any?) and the incline of both ramps is the same split of gravity in components, the net force on each cart will be the same and their accelerations will be the same.

 

[sciencebooks]

Physics time!

Q: for experiment 2, what might account for the different time and different distances measured?

A. The init v in each case is differ
B. the a in each case is differ
C. Both a and b
D. Neither a nor b

The relevant info for experiment 2 is that the angle is kept the same and a air cart with with the same mass goes up and down the track and the times are measured for going up and down and your also given the distance.

I choose C because I thought varying either the a or v would effect the distance and time, but the answer says its A because the angle is the same and all differences can be attributed to differ init V.

I don't understand how the angle
dictates constant acceleration.

Also without the book, but I chose A before checking the answer. Basically, if I'm interpreting it correctly, is it asking about the difference in time going up and down? Basically acceleration would be the same because it's a result of gravity only assuming no extra forces are applied (since the angels are the same, vectorized gravitational force is the same) and you see that velocity would be different.

(Lol, he basically stated the same above. Whoops.)

 

[GeorgiadisMD]

Acceleration in this problem is always constant because its gravity. Thus, the only thing that differs is Vo.