If an object is lying at rest on a surface, which of the following can you conclude about the force(s) acting on it? (A): No force is acting on it. (B): A pair of balanced forces is acting on it. (C): Multiple pairs of balanced forces are acting on it.

Match List-I (Phenomenon) with List-II (Explanation): List-I (a) Contact Force (b) Non-contact Force (c) Frictional Force (d) Pressure List-II 1. Force exerted when two surfaces are in direct contact 2. Force exerted without physical contact 3. Force opposing relative motion between surfaces 4. Thrust acting per unit surface area Select the correct answer code:

According to Newton's second law of motion, if the acceleration of a body is halved while its mass remains constant, the net force acting on it will _________.