問 1
1 点When you press a light switch to turn on a lamp, what is the reaction force to your finger pushing the switch?
Junior Secondary · Science
Action and reaction：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 5 問。すべて「Action and reaction」からの出題です。
10 問26 点無料・登録不要
問 2
1 点A book rests on a table. Which of the following statements correctly identifies the reaction force to the gravitational force exerted by the Earth on the book?
問 3
1 点Consider a rocket accelerating upwards immediately after launch. If the upward thrust generated by the engine is \(T\) , the downward gravitational pull on the rocket is \(W\) , and the downward air resistance is \(R\) . Which of the following represents the actual action-reaction pair to the force that propels the rocket (the upward thrust \(T\) )?
問 4
1 点When a swimmer performs a stroke, her hands push the water backwards. According to the principle of action and reaction, which force allows her to move forward through the pool?
問 5
1 点According to Newton's Third Law of Motion, when a swimmer pushes water backward with her hands, what is the reaction force?
問 6
2 点According to the principle of action and reaction, if a student pushes a wall with a horizontal force of \(50 \text{ N}\) to the left, what are the magnitude and direction of the reaction force exerted by the wall on the student's hand?
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
3 点A stationary book rests on a table. According to Newton's Third Law, what is the reaction force to the force of the table pushing upwards on the book (the normal force)? Where does this reaction force act?
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 8
5 点Explain why a rocket engine is able to produce thrust to change its velocity in the vacuum of outer space, where there is no air to push against, using the principle of action and reaction.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 9
4 点The principle of action and reaction is often observed in daily life, such as when someone jumps off a small boat.
a) When a person jumps forward from a small boat toward a pier, the boat is observed to move backwards. Explain this observation using the principle of action and reaction.
b) Clearly identify the action force and the reaction force in this specific interaction.
c) If the person pushes off the boat with a force of \( 120 \text{ N} \), what is the magnitude of the force that the boat exerts on the person?
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 10
7 点A student of mass \(50 \text{ kg}\) stands on a stationary skateboard on a smooth, horizontal floor. He is initially positioned next to a heavy vertical wall. The student then uses his hands to push the wall horizontally with a force of \(80 \text{ N}\).
(a) State the magnitude and direction of the force that the wall exerts on the student. Name the scientific principle that explains this phenomenon.(b) Identify the specific action and reaction force pair involved in this interaction. Clearly state which force acts on which object.
(c) The student moves backwards as a result of the push. A classmate argues that since the action and reaction forces are equal and opposite, they should cancel each other out, resulting in a net force of zero and no movement. Explain why this argument is scientifically incorrect.
(d) Suppose the student is replaced by a rocket. Explain how the principle of action and reaction allows a rocket to accelerate in the vacuum of space where there is no air to push against.
まず自分で答えを書いてから、解説と照らし合わせましょう。
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