The three laws of motion are:

1. An object at rest will remain at rest, or if in motion, will remain in motion at a constant speed and in a straight line, unless acted upon by an external force.
2. The acceleration of an object is directly proportional to the net force acting on it, and inversely proportional to its mass.
3. For every action, there is an equal and opposite reaction.

These laws can be used to describe a wide range of phenomena, from the motion of planets to the behavior of fluids to the propagation of waves. They are also used in many different fields, including engineering, medicine, and astronomy.

Newtonian mechanics is a very successful theory, and it has been used to predict the motion of objects with a high degree of accuracy. However, it has some limitations. For example, it cannot explain the behavior of light at the atomic and subatomic level. This is because light behaves both like a wave and a particle, which is something that Newtonian mechanics cannot describe.

Despite its limitations, Newtonian mechanics is still a very important and useful theory. It is used in many different fields, and it has helped us to understand the universe in a much deeper way.

Here are some examples of Newtonian mechanics in action:

• When you throw a ball, the ball accelerates due to the force of gravity.
• When you ride a bike, you need to pedal to keep moving forward because of the force of friction.
• When you sit in a chair, the chair exerts an upward force on you that balances the downward force of gravity.
• When you jump off a cliff, you accelerate due to the force of gravity until you hit the water.

Newtonian mechanics is a fundamental theory of physics, and it is essential for understanding how the world works.