Question

multiple choice question
newtons third law is the same as saying that
when two systems interact, the forces occur as an interaction pair.
when two systems interact, the action force causes an equal and opposite reaction force.
if two systems do not interact, their velocities do not change.
when two systems interact, they experience equal and opposite accelerations.

Explanation:

Newton's third law states that when two systems interact, the forces they exert on each other are equal in magnitude and opposite in direction (action - reaction pair).

• The first option is a correct description as it aligns with the concept of interaction pairs (action - reaction forces) in Newton's third law.
• The second option is incorrect because it implies a causal relationship (action force “causes” reaction force), but in reality, action and reaction forces are simultaneous.
• The third option is related to Newton's first law (inertia) which states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by a net external force.
• The fourth option is incorrect. According to \(F = ma\), even if two systems interact (have equal and opposite forces \(F_1=-F_2\)), if their masses \(m_1

eq m_2\), their accelerations \(a_1=\frac{F_1}{m_1}\) and \(a_2 = \frac{F_2}{m_2}\) will not be equal (\(a_1
eq - a_2\) when \(m_1
eq m_2\))

Answer:

When two systems interact, the forces occur as an interaction pair.