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Two - forces act in pairs. If object "A" acts on object "B", the object "B" will also act on object "A".

In many practical situations, there may be additional forces involved. For example, if an object is at rest despite the fact that a force acts on it, then it is obvious that an additional force acts on the same object, and in the opposite direction. In such cases, there are at least four forces involved, since according to Newton's Third Law, there must be an opposite force for each of these two forces. (Note that in Newton's Third Law, the two forces act on DIFFERENT objects, so the two forces that hold an object in balance do not quality as a pair of forces according to Newton's Third Law.)

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12y ago
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12y ago

There are four basic forces to work with: Lift, gravity, thrust and drag.

If lift is higher than gravity, the object floats. If thrust is greater than drag the object moves.

A object at rest maintains the same lift as gravity and the same thrust as drag.

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6mo ago

In Newton's third law, two forces always act at once. These forces are of equal magnitude but act in opposite directions on two different objects.

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Q: In newtons 3rd law how many forces always act at once?
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