Students wanted to find out if an empty barrel would roll down a ramp faster than one filled with sand. For their results to be valid, they should further ensure all of these, EXCEPT ONE. Which one need they NOT ensure?
A
That the barrels used are identical (when empty).
B
That the ramps used are identical.
C
That the barrels are released simultaneously.
D
That the barrels are released from the same point.
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Answer:
Students wanted to find out if an empty barrel would roll down a ramp faster than one filled with sand. For their results to be valid, they should further ensure all of these, EXCEPT ONE. Which one need they NOT ensure?
A
That the barrels used are identical (when empty).
B
That the ramps used are identical.
C
That the barrels are released simultaneously.
D
That the barrels are released from the same point.