Question

which statement is true of forces?forces do not have specific strength.forces always act in pairs.forces will always cause motion.

Explanation:

• Analyze the first option: Forces have a specific strength (measured in units like Newtons), so "Forces do not have specific strength" is false.
• Analyze the second option: According to Newton's third law, forces always occur in action - reaction pairs. So this statement is true.
• Analyze the third option: Forces do not always cause motion. For example, if an object is at rest on a table, the gravitational force and the normal force are balanced, and there is no motion. So "Forces will always cause motion" is false.

Answer:

B. Forces always act in pairs.