SIR ISAAC NEWTON AND THE THREE LAWS OF MOTION. LAWS OF MOTION ARISTOTLE (384-322 B.C.) - Greek scientist, philosopher. Felt a force was needed to move.

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Newton’s Laws of Motion

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Presentation transcript:

SIR ISAAC NEWTON AND THE THREE LAWS OF MOTION

LAWS OF MOTION ARISTOTLE ( B.C.) - Greek scientist, philosopher. Felt a force was needed to move an object. EX: You would have to keep a continuous force applied to a book to keep it moving across a table. “The natural state of an object was at rest. The greater the force, the greater the speed.” ARISTOTLE ( B.C.) - Greek scientist, philosopher. Felt a force was needed to move an object. EX: You would have to keep a continuous force applied to a book to keep it moving across a table. “The natural state of an object was at rest. The greater the force, the greater the speed.”

LAWS OF MOTION GALILEO GALILEI ( ) - Italian scientist. Concluded that it is just as natural for a body to be in motion with a constant speed as it is to be at rest. GALILEO GALILEI ( ) - Italian scientist. Concluded that it is just as natural for a body to be in motion with a constant speed as it is to be at rest.

NEWTON’S LAWS ISAAC NEWTON ( ) - English scientist. Wrote famous mathematical book Principia in This book outlined his famous Laws of Motion. ISAAC NEWTON ( ) - English scientist. Wrote famous mathematical book Principia in This book outlined his famous Laws of Motion.

1ST LAW OF MOTION “ Every body continues in its state of rest or uniform speed in a straight line unless it is compelled to change that state by a net force acting on it.” LAW OF INERTIA: The tendency of a body to stay at rest or uniform speed. “ Every body continues in its state of rest or uniform speed in a straight line unless it is compelled to change that state by a net force acting on it.” LAW OF INERTIA: The tendency of a body to stay at rest or uniform speed.

2ND LAW OF MOTION “ The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.” An object moves faster when you apply more force to it. The bigger the object is, the harder it is to move. F = ma “ The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.” An object moves faster when you apply more force to it. The bigger the object is, the harder it is to move. F = ma

2ND LAW OF MOTION The bobsled accelerates because the racers are exerting a force on the sled.

2ND LAW OF MOTION FORCEMASSACCELERATION 1 kg 1 N 2 N 3 N 1 m/s 2 m/s 3 m/s x

2ND LAW OF MOTION FORCEMASSACCELERATION 1 N 1 kg2 kg 1 m/s 0.5 m/s

3RD LAW OF MOTION “ Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.” FOR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION. “ Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.” FOR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION.

3RD LAW OF MOTION WHAT ARE THE FORCES IN THIS PICTURE?

3RD LAW OF MOTION WHAT ARE THE FORCES IN THIS PICTURE?

3RD LAW OF MOTION WHAT ARE THE FORCES IN THIS PICTURE?

#1#1 An air hockey puck is pushed along a frictionless surface. The puck will continue to slide forever in the same direction at a constant speed.

#2#2 You try to push Mr. Hooker; then you try to push a chair. Mr. Hooker will not go as far as the chair, because he has a larger mass. According to Newton’s 2 nd Law of Motion, it takes more force to move him.

#3#3 You dribble a basketball. When you push against the basketball, the ball pushes against your hand. When the ball hits the floor, the floor pushes against the ball and it bounces back up.