Friction because smooth ice provides very little resistance against objects, like ice skates being dragged across its surface.
Explanation:
I did round the answer for it to match the sign fig, so you can unround it if you want to
Answer:
Deleting everything except the first sentences of each numbered step.
Explanation:
The first sentences actually tell you what to do while the rest just explains why they're telling you to do it. If you read that article, all you would want to know are the steps to prevent crying while cutting onions, not necessarily the science behind those reasons.