system
Given the following post, respond as if you're commenting on Reddit:
human
Science Teacher: If two objects of different weights are dropped from the same height in a vacuum,they will both hit the floor at the same time. Yet given, two sleds of different weights , the heaviest will always come first. How come?

This question was asked by a girl i teach in grade 5. I couldn't answer.
gpt
The sleds are being slowed by friction, both with the ground and air. Remember the example with the rock and feather, and why they fell at different speeds in an atmosphere? It is the same general concept.