Final answer:
The provided statements about normal reaction, types of interference, external forces, work function in the classical wave model, the energy of a thrown rock, and the safety of credit cards around magnets have been corrected with true or false answers relevant to their physics context.
Step-by-step explanation:
Answering Physics True or False Questions
Blocked energy being a form of defensive behavior is not within the scope of physics. However, let's explore other True or False questions related to physics principles:
1. The correct answer to the statement, "Normal reaction is the force that opposes the force of gravity and acts in the direction of the force of gravity," is False. The normal reaction is indeed a force, but it acts perpendicular to the surface of contact and not in the direction of the force of gravity.
2. It is True that the two types of interference are constructive and destructive interference. These phenomena occur when two waves overlap, and the resultant wave has either a larger amplitude (constructive) or a smaller one (destructive) compared to the original waves.
3. An external force is indeed defined as a force generated outside the system of interest that acts on an object inside the system, making the statement True.
4. The statement that a work function (or binding energy) is permissible under the classical wave model is False; this concept applies in the context of quantum mechanics, not classical physics.
5. The claim that increasing the height of a thrown rock will increase its kinetic energy is False. Actually, as the rock rises, its kinetic energy decreases and its potential energy increases.
6. It is not recommended to place credit cards with magnetic strips near permanent magnets as it might demagnetize the strips, hence the statement is True.