When two objects interact, the forces they excery on each other are equal and opposite.
- That means if you push a something, like a shopping trolley, the trolley will push back against you, just as hard.
- As soon as you stop pushing, so does the trolley.
With two ice skaters, if they push against each other they will both feel an equal same sized force, in the opposite direction and so accelerate away from each other.
Skater A's mass is 55 kg and skater B's is 65kg. Therefore skater A will accelerate more than skater B, becuase of her smaller mass (a=F/m)
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