| NSES Content Standard B
Physical Science: Motions and forces Grades 9-12, page 179 Objects change their motion only when a net force is applied. Laws of
motion are used to calculate precisely the effects of forces on the motion
of objects. The magnitude of the change in motion can be calculated using
the relationship F=ma, which is independent of the nature of the force.
Whenever one object exerts force on another, a force equal in magnitude
and opposite in direction is exerted on the first object.
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Benchmark 4F The Physical Setting: Motion
Grades 9-12, page 92
Whenever one thing exerts a force on another, an equal amount of force
is exerted back on it.