Which of the following physical quantities changes or tends to change the state of rest or of uniform motion of a body in a straight line?
Force
The correct answer is Option 1: Force.
Explanation
According to Newton's First Law of Motion (also known as the Law of Inertia), an object will remain at rest or continue to move at a constant velocity in a straight line unless acted upon by a net external force.
A force is essentially a push or a pull resulting from an object's interaction with another object. It is the specific physical quantity required to overcome an object's natural resistance to change and alter its speed, direction, or state of rest.
Why the Other Options Are Incorrect
Option 2 (Mass): Mass is a scalar quantity that measures the amount of matter in an object. It determines how much the object will resist a change in motion, but mass itself cannot cause a change in motion.
Option 3 (Momentum): Momentum is the product of an object's mass and its velocity (\(p = mv\)). It describes the quantity of motion an object possesses, but it does not change the state of motion; rather, a force is required to change momentum.
Option 4 (Inertia): Inertia is the property or tendency of an object to resist any change in its state of rest or uniform motion. It is not a physical quantity that causes a change; instead, it is what a force must overcome to cause a change.
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