State Newton's second law of motion.

Newton's second law of motion states that the acceleration of an object is directly proportional to the force applied.

In mathematical terms, this can be expressed as F = ma, where F is the force applied to an object, m is the mass of the object, and a is the resulting acceleration. This means that the greater the force applied to an object, the greater its acceleration will be, and the greater the mass of an object, the smaller its acceleration will be for a given force.

This law is fundamental to understanding the behaviour of objects in motion, and is used extensively in physics and engineering. It allows us to predict how objects will move under different conditions, and to design systems that can control and manipulate motion.

For example, if we want to calculate the force required to accelerate an object of a given mass to a certain speed, we can use Newton's second law. We can rearrange the equation to find the force required: F = ma = m x a. So if we know the mass of the object and the desired acceleration, we can calculate the force required to achieve that acceleration.

Overall, Newton's second law of motion is a powerful tool for understanding and predicting the behaviour of objects in motion, and is essential knowledge for anyone studying physics or engineering.