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Download Notes on Newton`s Laws of Motion
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Notes on Newton’s Laws 11/07 Newton’s First Law of Motion Newton’s First Law of Motion • “The state of motion of an object does not change as long as the net force acting on the object is zero” Newton’s First Law of Motion • “The state of motion of an object does not change as long as the net force acting on the object is zero” • What does this mean? Newton’s First Law of Motion • “The state of motion of an object does not change as long as the net force acting on the object is zero” • What does this mean? – If an object is at rest, it stays at rest Newton’s First Law of Motion • “The state of motion of an object does not change as long as the net force acting on the object is zero” • What does this mean? – If an object is at rest, it stays at rest – If an object is moving, it keeps moving with the same velocity Newton’s First Law of Motion • “The state of motion of an object does not change as long as the net force acting on the object is zero” • What does this mean? – If an object is at rest, it stays at rest – If an object is moving, it keeps moving with the same velocity – This is called inertia (the tendency of an object to resist a change in motion) Newton’s Second Law of Motion Newton’s Second Law of Motion • “The acceleration of an object is equal to the net force acting on it divided by the object’s mass” Newton’s Second Law of Motion • “The acceleration of an object is equal to the net force acting on it divided by the object’s mass” • Acceleration = net force/mass, or a = F/m Newton’s Second Law of Motion • “The acceleration of an object is equal to the net force acting on it divided by the object’s mass” • Acceleration = net force/mass, or a = F/m • Mass is the amount of matter in an object and stays constant Newton’s Second Law of Motion • “The acceleration of an object is equal to the net force acting on it divided by the object’s mass” • Acceleration = net force/mass, or a = F/m • Mass is the amount of matter in an object and stays constant • Weight is the force of gravity on an object and can change (W = mg) Newton’s Second Law of Motion • “The acceleration of an object is equal to the net force acting on it divided by the object’s mass” • Acceleration = net force/mass, or a = F/m • Mass is the amount of matter in an object and stays constant • Weight is the force of gravity on an object and can change (W = mg) – W = weight (in N) Newton’s Second Law of Motion • “The acceleration of an object is equal to the net force acting on it divided by the object’s mass” • Acceleration = net force/mass, or a = F/m • Mass is the amount of matter in an object and stays constant • Weight is the force of gravity on an object and can change (W = mg) – W = weight (in N) – m = mass (in kg) Newton’s Second Law of Motion • “The acceleration of an object is equal to the net force acting on it divided by the object’s mass” • Acceleration = net force/mass, or a = F/m • Mass is the amount of matter in an object and stays constant • Weight is the force of gravity on an object and can change (W = mg) – W = weight (in N) – m = mass (in kg) – g = acceleration due to gravity – on earth, this is 9.8 m/s2 Newton’s Third Law Newton’s Third Law • “whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.” Newton’s Third Law • “whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.” • In other words: “for every action, there is an equal and opposite reaction”