For each of he following: Which object exers the reaction force, on which is the reaction exerted, the magnitude of the reaction force and its direction:
1. I put a downward force of 490N on a chair I am sitting on
2. I exert a backward force of 25N on the ground as I walk
3. Soccer player kicks a ball with 250N toward the south
4. Earth pulls the moon to its centre with a force of 2.0N
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