Newton's First Law of Motion

Newton's First Law of Motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion with a constant velocity, unless acted upon by a net external force.

Key Concepts:

1. Inertia: The tendency of an object to resist changes in its state of motion.
2. Net External Force: The overall force acting on an object, taking into account all the individual forces and their directions.
3. Constant Velocity: Movement at a consistent speed and in a straight line.

Examples:

• An object sliding on a frictionless surface will continue moving at a constant velocity unless a force is applied to stop it.
• A book at rest on a table will remain stationary unless a force is exerted to move it.

Study Guide:

To understand Newton's First Law, consider the following questions:

1. What is inertia and how does it relate to the first law of motion?
2. How does the concept of net external force apply to objects in motion and at rest?
3. Why is it important to consider the absence of friction when illustrating the first law of motion?

Key terms to understand:

• Inertia
• Net external force
• Constant velocity

Additional practice can involve solving problems involving the application of Newton's First Law to various scenarios, such as objects on inclined planes, in free fall, or experiencing different types of friction.

Understanding Newton's First Law is fundamental to comprehending the behavior of objects in the absence of external forces, as well as the concept of equilibrium and the role of forces in causing changes in motion.

Good luck with your studies!