Physics Lesson Review Question - Inclined Plane - Wrong?

[pszopa1343]

Question 2:
"On which surface would the block used in experiment I experience the greatest acceleration when the plane is at θk?

A) 2
B) 3
C) 4
D) the acceleration of the blocks remains constant for all surfaces."

The question is asking about the variable θk with respect to the 4 surfaces. The blocks accelerate proportionally to:

F(down the plane) - Fk(up plane) = mgsinθk - μkmgcosθk

because its always the same mass. The F down the plane increases with θk, and the F kin friction decreases with and increase in θk. So without any calculating I would say the correct answer should be the one with the largest θk, b not d. None of the blocks accelerate at g unless the plane is 90deg. Which they are not.

Opinions?

[jellywing_2058]

Can you please precise which question you are referring to? Is this from the lessons, from the Gold Standard, etc.

[pszopa1343]

Physics Online Lesson Review Chapter 3 - Particle Dynamics

Question 2 - Inclined Plane

Sorry about that.