How do Newton's laws apply to motion under gravity?

Newton's laws apply to motion under gravity in the same way as any other motion.

When an object is under the influence of gravity, it experiences a force known as weight. This force is proportional to the mass of the object and the acceleration due to gravity. Newton's second law states that the force acting on an object is equal to its mass multiplied by its acceleration. Therefore, the same equation can be used to describe the motion of an object under gravity as any other motion.

Newton's third law also applies to motion under gravity. When an object is attracted towards the Earth, the Earth is also attracted towards the object with an equal and opposite force. This is known as the gravitational force and is described by Newton's law of gravitation.

Finally, Newton's first law, also known as the law of inertia, applies to motion under gravity. An object at rest will remain at rest unless acted upon by an external force. Similarly, an object in motion will continue to move in a straight line at a constant speed unless acted upon by an external force. This means that if an object is thrown upwards, it will continue to move upwards until the force of gravity brings it back down.

In summary, Newton's laws apply to motion under gravity in the same way as any other motion. The force of gravity can be described using Newton's law of gravitation, while the motion of an object under gravity can be described using Newton's second law. Finally, Newton's first law applies to objects at rest or in motion under gravity.