Force pushes or pulls objects along line between interacting-object centers. When one object exerts force in a direction on another object, second object exerts same force in opposite direction on first object {reaction, forces}. Relation is symmetric.
examples
Rockets burn fuel. Hot gas pushes rocket forward, while rocket pushes gas backward in opposite direction.
For objects on coil springs, coil spring pushes object up, while object pushes coil spring down.
When walking, foot pushes back against ground, and ground pushes back on person, to send body forward.
An hourglass on a balance has dropping sand, but balance stays still, because weight is constant. Downward collisions balance upward force.
Physical Sciences>Physics>Dynamics>Resultant
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Date Modified: 2022.0224