Question

identify the true statements.
choose all answers that apply:
a in order for an object to experience a force, it must interact with another object.
b if newtons third law applies to a pair of objects, newtons second law cannot apply to those objects at the same time.
c newtons third law only applies to pairs of objects that are in contact (touching).
d for every individual force acting on an object, there is an equal and opposite force acting on another object.

Explanation:

• Statement A: Force is an interaction between objects. An object cannot experience a force in isolation. So, this statement is true.
• Statement B: Newton's second law (\(F = ma\)) and third law (action - reaction) can both apply to objects simultaneously. For example, when you push a box (action - reaction between you and the box, third law), and the box accelerates (second law). So, this statement is false.
• Statement C: Newton's third law applies to non - contact forces (e.g., gravitational force between the Earth and the Moon). So, this statement is false.
• Statement D: This is the essence of Newton's third law. For every force \(F_{12}\) (force on object 2 due to object 1), there is a force \(F_{21}=-F_{12}\) (force on object 1 due to object 2). So, this statement is true.

Answer:

A. In order for an object to experience a force, it must interact with another object; D. For every individual force acting on an object, there is an equal and opposite force acting on another object.