An object at rest remains at rest, and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force.
Newton’s first law of motion describes the motion of an object that has a net force of 0N acting on it.
Newton’s first law is sometimes called the law of inertia. Inertia is the tendency of all objects to resist any change in motion.
2 Parts
Part 1: Objects at Rest: Objects at rest will stay at rest unless they are acted on by an unbalanced force.
Part 2: Objects in Motion: Objects will continue to move with the same velocity unless an unbalanced force.
The acceleration of an object depends on the mass of the object and the amount of force applied.
Newton’s second law describes the motion of an object when an unbalanced force acts on the object
Part 1: Acceleration Depends on Mass The acceleration of an object decreases as its mass increases. Its acceleration increases as its mass decreases.
Part 2: Acceleration Depends on Force An object’s acceleration increases as the force on the object increases. The acceleration of an object is always in the same direction as the force applied.
Newton’s Second law can also be expressed mathematically: F = ma