Section 1 3 Newtons Laws of Motion Newtons

Section 1 -3 Newton’s Laws of Motion

Newton’s Laws of Motion • Sir Issac Newton published a book called Principia • He explained 3 laws of motion (even though he did not discover all of them)

Newton’s First Law of Motion • States: An object at rest remains at rest and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force • Newton’s 1 st Law is sometimes called the law of Inertia • Inertia- the tendency of objects to resist any changes of motion • Object at rest- object that is not moving • Object in motion- object that is moving • Unbalanced force that acts on every moving object is friction

Newton’s Second Law of Motion • States: The Acceleration of an object depends on the mass of the object and the amount of force applied • Force= Mass X Acceleration • Acceleration= Force Divided by Mass

Newton’s Third Law of Motion • States: Whenever an object exerts a force on a second object exerts an equal and opposite force on the first • All forces act in pairs

Momentum Is a Property of Moving Objects • Momentum- property of a moving object that depends on the objects mass and velocity • Law of Conservation of Momentum- any time 2 objects interact, they may exchange momentum, but the total amount of momentum stays the same • This explains Newton’s 3 rd Law of Motion