Question

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newtons third law of motion: action and reaction worksheet
newtons third law of motion states that for every action, there is always
an equal and opposite reaction. this means that whenever one object
applies a force on a second object, the second object applies an equal
force in the opposite direction back on the first object. you can see this in
everyday life: when you push on a wall, the wall pushes back on you; when
you walk, your feet push against the ground and the ground pushes you
forward. rockets move because they push gas out one way and the gas
pushes the rocket the other way.
fill in the blank: fill in the blank with one of the words from the word
bank below.

1. newtons third law says that for every ________, there

is an equal and opposite reaction.

1. when you push against a desk, the desk pushes

________ on you.

1. a rocket accelerates because it pushes ________ out

the back, and the gas pushes the rocket forward.

1. if you step on sand, your weight pushes ________, and

the sand pushes ________.

1. when an astronaut throws something in space, the thrown object

moves in one direction and the astronaut moves in the
________ direction.
word bank: reaction, gas, opposite, down, up, action, back, forward

Explanation:

1. The first sentence of the text on Newton's Third Law of Motion directly states "for every action, there is always an equal and opposite reaction", so "action" fits.
2. According to Newton's Third Law, when you push an object (the desk), it pushes back. So "back" is correct.
3. The text mentions "Rockets move because they push gas out one way and the gas pushes the rocket the other way", so "gas" is the answer.
4. When you step on sand (weight pushing down), the sand pushes up (opposite reaction). So "down" and "up" are correct.
5. When an object is thrown in space, due to Newton's Third Law, the astronaut moves in the opposite direction. So "opposite" is correct.

Answer:

1. action
2. back
3. gas
4. down; up
5. opposite