Difference between of seiving and winnowing​

Winnowing is the separation of solid-solid separated by size and weight whereas sieving is the separation solid-liquid judged by shape and size. Winnowing is used to separate heavier and lighter components of a mixture by wind or blowing air. ... Sieving is used when components of a mixture have different sizes.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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