Question

question #1
what is the relationship between the force you apply to a heavy box and the force the box applies back to you?
a. the forces are equal in strength but act in the same direction.
b. the force you apply is stronger than the force the box applies back.
c. the forces are equal in strength but act in opposite directions.
d. the force the box applies back is stronger than the force you apply.
question #2
according to the text, what is a good example of force pairs in action?
a. a bird flying in the air.
b. a car driving down a road.
c. a person sitting on a chair.
d. a book lying on a table.
question #3
what is the main idea of newton’s third law of motion as explained in the text?
a. every action has an equal and opposite reaction.
b. objects at rest stay at rest, and objects in motion stay in motion.
c. force equals mass times acceleration.
d. the force of gravity pulls all objects towards the center of the earth.

Explanation:

Question #1 Step1: Identify Newton's 3rd Law

Newton's 3rd Law states that for every applied force, there is an equal and opposite reaction force.

Question #1 Step2: Match to option

This matches option C, as the applied force and reaction force are equal in magnitude, opposite in direction.

Question #2 Step1: Define force pairs

Force pairs are two equal, opposite forces acting on two different objects.

Question #2 Step2: Analyze options

• A: Bird's wing pushes air (force 1), air pushes wing (force 2) – but this is also a pair, however a person sitting on a chair: person pushes chair (force 1), chair pushes person (force 2) is a more direct, classic example of contact force pairs as described in basic physics.
• B: Car's force on road, road's force on car is present but not the clearest example.
• C: Person exerts downward force on chair; chair exerts upward normal force on person – clear, equal and opposite force pairs on two objects.
• D: Book's gravity and table's normal force are a balanced force pair on the same object, not action-reaction pairs acting on separate objects.

Thus option C is correct.

Question #3 Step1: Recall Newton's 3rd Law

Newton's Third Law of Motion is formally stated as: For every action, there is an equal and opposite reaction.

Question #3 Step2: Match to option

This directly matches option A. Option B is Newton's 1st Law, option C is Newton's 2nd Law, option D describes gravitational force, not the 3rd Law.

Answer:

Question #1: C. The forces are equal in strength but act in opposite directions.
Question #2: C. A person sitting on a chair.
Question #3: A. Every action has an equal and opposite reaction.