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If you push someone or something, the same amount of force comes back at you and makes you move back.

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If two people are on chairs and you kick the other person down, the reaction is for your chair to go back as well.

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When swimming your pushing the water back which causes it to have a force back on you and make you go forward.

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When you jump out of the boat (action) the reaction of the boat is to go back.

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When the air goes out of the balloon the reaction is for the balloon to go up.

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Pulling a pebble is much easier than pulling a big rock because the pebble has less mass.

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Pushing an elephant is different than pushing a smaller animal because it has more mass so you have to use more force.

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The amount of force you use depends on how much mass the object has.

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Both are pulling with the same force so it isn't moving a lot, if one has more force then the rope will start pulling the other person.

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Pushing a car and a lawn mower is different because the car has more mass so you use more force.

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You and the car are in motion but when you brake hard, you keep going but then the seat belt stops you.

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You're inside the roller coaster cart while it's in motion so you're in motion too until an unbalanced force stops it.

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You and the skateboard are in motion and an unbalanced force (rock) is at rest, so when you hit the rock the skateboard stops but you stay in motion and fly off.

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The ball is at rest and you're leg is in motion so once you kick the ball, the energy passes on to the ball and causes it to go forward.

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While they car is in motion, you're in motion as well. When the car hit an unbalanced force, you were still in motion so it caused you to go forward.