Newton’s Laws of Motion: High School Physics Study Guide Subject: Physics | Grade: Grade 10-12 This study guide explains the fundamental principles of classical mechanics: Newton's Three Laws of Motion. Understanding these laws is essential for solving physics problems involving forces, acceleration, and mass. Newton's First Law (Law of Inertia) "An object at rest remains at rest, and an object in motion continues in motion with a constant velocity, unless acted upon by a net external force." • Inertia is the resistance of any physical object to any change in its velocity. • Example: When a bus suddenly brakes, passengers lurch forward because their bodies want to maintain their forward motion. Net Force Equation () "The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass." The equation is: Where: • is the net force acting on the object (measured in Newtons, N). • is the mass of the object (measured in kilograms, kg). • is the acceleration of the object (measured in ). Sample Problem A box with a mass of