Problem 2: Newton\'s Third Law is also known as the Law of Action and Reaction.

Question

Problem 2: Newton's Third Law is also known as the Law of Action and Reaction. The law says "when A pushes B, B pushes on A with the same amount of force but in the opposite direction." A common a "cause" misconception is that "action is "cause" and "reaction is effect". But it turns out that "action" is and is another "cause", each having its own effect. Example: A child jumps and lands on a trampoline. Not action and reaction: As the child lands on the trampoline, the child pushes down on the trampoline and the trampoline bends downward. it is an effect This IS NOT reaction", bekaasn This is action and reaction: Reaction Action The trampoline exerts an upward force on the Cause A child exerts a downward force on the line The child's downward motion stops (or The trampoline bows downward Effect reverses) Now you try. Make sure your action has a thing doing the forcing, a thing being forced, and a direction. (a) A horse-and-wagon are initially at rest. The horse begins to accelerate by walking forward. Reaction The wagon Cause The horse... The horse... Effect The wagon... (b) A heavy car collides with a light car. The cars don't stick together. Reaction Action The light car Cause The heavy car. The heavy car... Effect The light car

Explanation / Answer

a] Cause: The horse exerts a force to the right on the wagon. Reaction: The wagon exerts an opposite force on the horse.

Effect: The wagon moves to the right. Reaction: The horse stops due to the opposite force by wagon.

b]

Cause: The helicopter exerts a downward force on the air. Reaction: The air exerts an upward force on the helicopter giving rise to the necessary lift.

Effect: The air flows downwards due to the downward force. Reaction: The helicopter remains at the same position due to balancing of the gravitational force and this reaction force provided by air.

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