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Motion

Newton ’ s Laws of Motion. The Man Behind the Laws His mom wanted him to be a farmer. He was motivated at school by trying to be smarter than a bully

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Page 1: Newton ’ s Laws of Motion. The Man Behind the Laws  His mom wanted him to be a farmer.  He was motivated at school by trying to be smarter than a bully

Newton’s Laws of Motion

Page 2: Newton ’ s Laws of Motion. The Man Behind the Laws  His mom wanted him to be a farmer.  He was motivated at school by trying to be smarter than a bully

The Man Behind the Laws His mom wanted him to be a farmer. He was motivated at school by trying to be

smarter than a bully. His college closed for a while because of the

plague, and, while on break, discovered and wrote the law of gravity.

He discovered calculus and even invented the reflective telescope (he’d also stare at the sun until he would lose his vision).

There really was an apple tree—but the apple probably didn’t hit him in the head. He wondered why the apple always fell in a straight line and applied the idea to the moon

Page 3: Newton ’ s Laws of Motion. The Man Behind the Laws  His mom wanted him to be a farmer.  He was motivated at school by trying to be smarter than a bully

The 3 Laws

The law of inertia The law of

acceleration The law of equal

and opposite forces

The laws are universal. Apply to planets and

peas

                               

Page 4: Newton ’ s Laws of Motion. The Man Behind the Laws  His mom wanted him to be a farmer.  He was motivated at school by trying to be smarter than a bully

First Law: The law of inertia An object at rest

remains at rest, and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force

Friction is an unbalanced force

Inertia means resisting change in motion

Page 5: Newton ’ s Laws of Motion. The Man Behind the Laws  His mom wanted him to be a farmer.  He was motivated at school by trying to be smarter than a bully

Second Law: The law of acceleration

The acceleration of an object depends on the object’s mass and the force applied to it

A=f/m F=ma

Explains why objects fall with same acceleration (10N=1kg)

                                                              

                               

Page 6: Newton ’ s Laws of Motion. The Man Behind the Laws  His mom wanted him to be a farmer.  He was motivated at school by trying to be smarter than a bully

Third Law: Equal and Opposite

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first

Forces act in pairs

Action and reaction forces act on different objects

                       

                                       

Page 7: Newton ’ s Laws of Motion. The Man Behind the Laws  His mom wanted him to be a farmer.  He was motivated at school by trying to be smarter than a bully

The Laws at Work