Question

which are rules used when adding forces together? subtract forces in opposite directions. the smallest forces are never counted. add forces in the same direction. forces not in the same direction or in opposite directions cannot be directly added together.

Explanation:

When adding forces:

• Forces in the same direction are added. For example, if two forces \(F_1\) and \(F_2\) act in the same direction, the resultant force \(F = F_1+F_2\).
• Forces in opposite directions are subtracted. If \(F_1\) and \(F_2\) act in opposite directions (\(F_1>F_2\)), the resultant force \(F = F_1 - F_2\) (direction of \(F_1\)).
• Forces not in the same or opposite directions (e.g., at an angle) cannot be directly added. They require vector - addition methods (like the parallelogram law).
• The smallest forces are counted. For example, in a system with multiple forces (even if one is small), all contribute to the net force calculation.

Answer:

Subtract forces in opposite directions, Add forces in the same direction, Forces not in the same direction or in opposite directions cannot be directly added together.