Newton's Third Law Calculator

Yes. Earth pulls you downward with gravitational force $$F = mg$$, and you pull Earth upward with exactly the same force. However, because Earth's mass is approximately $$5.97 \times 10^{24}$$ kg, its acceleration is negligibly small (about $$10^{-23}$$ m/s² for a 70 kg person).

A rocket expels exhaust gases at high speed. The rocket pushes the exhaust backward (action), and the exhaust pushes the rocket forward (reaction). No external medium (like air) is needed — the interaction is purely between the rocket and its exhaust, which is why rockets work perfectly in vacuum.

No. Action-reaction pairs also exist for non-contact (field) forces such as gravity, electromagnetic force, and even the strong nuclear force. Earth and the Moon exert equal gravitational forces on each other despite being 384,000 km apart.

Because both objects experience the same magnitude of force, Newton's Second Law $$a = F/m$$ dictates that the object with less mass undergoes greater acceleration. This is why a rifle recoils much less than the bullet it fires, even though the forces are identical.

Yes. The sign of the force indicates direction. If the action force is negative (e.g., -50 N pointing left), the reaction force is positive (+50 N pointing right). The magnitudes are always equal; only directions differ.