Question

watch it! go to this link and click \play video\: http://studyjams.scholastic.com/studyjams/jams/science/f orces-and-motion/action-and-reaction.htm then answer these questions: 1. provide your own example of an action/reaction force pair. 2. what is newton’s 3rd law of motion? 3. if you were to push on a brick wall with 100 n of force, how much force would the wall push back towards you?

Explanation:

Question 1

An action - reaction force pair occurs when two objects interact, and the force exerted by the first object on the second is equal in magnitude and opposite in direction to the force exerted by the second object on the first. For example, when a person jumps off a boat, the person exerts a force on the boat (pushing it backward), and the boat exerts an equal and opposite force on the person (pushing the person forward). This is a classic example of an action - reaction force pair as per Newton's third law.

Newton's 3rd Law of Motion states that for every action, there is an equal and opposite reaction. In other words, when one object exerts a force (action force) on a second object, the second object exerts a force (reaction force) on the first object that is equal in magnitude, opposite in direction, and acts along the same line of action.

Step 1: Recall Newton's 3rd Law

Newton's third law states that the action and reaction forces are equal in magnitude and opposite in direction.

Step 2: Apply the law to the problem

When you push on the brick wall with a force of 100 N (this is the action force), the wall will exert a reaction force on you. According to Newton's third law, this reaction force will have the same magnitude as the action force. So the magnitude of the force the wall pushes back towards you is equal to the force you exerted on the wall.
<Expression>
Since the force you apply (action force) $F_{you - wall}= 100\ N$, the force the wall applies on you (reaction force) $F_{wall - you}=F_{you - wall} = 100\ N$
</Expression>

Answer:

An example of an action - reaction force pair is: When a person jumps off a boat, the person exerts a force on the boat (action force, pushing the boat backward), and the boat exerts an equal - in - magnitude and opposite - in - direction force on the person (reaction force, pushing the person forward).

Question 2