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Forces. Chapter 2, Section 3 Newton’s First and Second Laws. The First Law of Motion. Newton’s First Law of Motion – an object in motion stays in motion, an object at rest stays at rest unless acted on by an outside force.
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Forces Chapter 2, Section 3 Newton’s First and Second Laws
The First Law of Motion • Newton’s First Law of Motion – an object in motion stays in motion, an object at rest stays at rest unless acted on by an outside force. • If an object is not moving, it will not move until it is acted on by an unbalanced (outside) force. • Clothes on the floor of your room.
If an object is moving, it will continue to move until acted on by an unbalanced (outside) force. • Tennis ball flying through the air • Gravity and Friction are often the unbalanced forces that change an object’s motion.
Inertia • Inertia – the tendency to resist a change in motion. • Newton’s first law describes inertia • When driving in a car, why do you move forward in your seat when you come to a quick stop? • The greater the mass, the greater the inertia • Semi truck vs. chair
Newton’s Second Law of Motion • Newton’s Second Law of Motion – The force of an object equals the mass of the object times the acceleration of an object (F=MA). • F = Newtons (N) • Mass = kilograms (kg) • Acceleration = meters per square second (m/s2)
