Final answer:
Newton's 3rd Law states that for every action, there is an equal and opposite reaction. This applies to the force spring scales held by students. When a student pulls on the scale, it exerts a force on their hand in the opposite direction.
Step-by-step explanation:
Newton's 3rd Law states that for every action, there is an equal and opposite reaction. This law applies to the force spring scales held by the students. When a student pulls on the spring scale, the scale exerts a force on the student's hand in the opposite direction.
For example, if a student pulls downward on the spring scale with a force of 10 Newtons, the spring scale will exert an upward force of 10 Newtons on the student's hand. This is because the force applied by the student and the force applied by the scale are equal in magnitude and opposite in direction.
According to Newton's 3rd Law, the action force and the reaction force always occur in pairs. In this case, the action force is the force applied by the student, and the reaction force is the force applied by the spring scale.
Learn more about Newton's 3rd Law