What is necessary to increase or decrease the velocity of a body according to the formula for force?

• A. Mass and velocity
• B. Mass and acceleration
• C. Force and mass
• D. Temperature and volume

Answer: (B)

The correct answer highlights the relationship between mass and acceleration when discussing the formula for force, which is derived from Newton's Second Law of Motion. The law states that force equals mass multiplied by acceleration (F = ma).

In this context, to increase or decrease the velocity of an object, one must consider how acceleration (the rate of change of velocity) is influenced by force and mass. If you apply a force to an object, the resulting acceleration will depend on the mass of that object. A greater mass will result in less acceleration if the same force is applied, while a smaller mass will result in greater acceleration under the same conditions.

Thus, the interplay of mass and acceleration is crucial for understanding how to manipulate the velocity of a body, making this option the correct choice. Other options do not accurately reflect the fundamental principles of motion and force as described in physics.