According to Newton's laws, what is the result of an unbalanced force acting on a stationary object?

• A. The object remains stationary
• B. The object starts to move
• C. The object moves at constant speed
• D. The object's velocity becomes zero

Answer: (B)

The correct answer reflects the principle that an unbalanced force acting on a stationary object will cause that object to begin to move. Newton's first law of motion, often referred to as the law of inertia, states that an object at rest will remain at rest unless acted upon by a net external force. Therefore, if an unbalanced force is applied to a stationary object, it overcomes the object's inertia and causes it to accelerate in the direction of the force.

This principle is fundamental in understanding motion and force interactions in physics. The stationary object, initially resting, will have its state of motion altered by the application of this force, leading to a change in its velocity. Thus, when an unbalanced force is exerted, it triggers a change from a state of rest to motion, illustrating the direct relationship between force and acceleration as outlined in Newton's second law.