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Inertia!. History ~300 B.C.E. Aristotle (Greek) ~300 B.C.E. Aristotle (Greek) Divided motion into two categories: Divided motion into two categories:

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Presentation on theme: "Inertia!. History ~300 B.C.E. Aristotle (Greek) ~300 B.C.E. Aristotle (Greek) Divided motion into two categories: Divided motion into two categories:"— Presentation transcript:

1 Inertia!

2 History ~300 B.C.E. Aristotle (Greek) ~300 B.C.E. Aristotle (Greek) Divided motion into two categories: Divided motion into two categories: Natural motion: straight up or straight down Natural motion: straight up or straight down Violent motion: result of force Violent motion: result of force Any movement against nature was because of a force Any movement against nature was because of a force Everything rests on Earth; Earth is too big to move Everything rests on Earth; Earth is too big to move

3 Copernicus ~1500 C.E. ~1500 C.E. Studied astronomy Studied astronomy Observed that astronomy worked better if Sun was center of solar system Observed that astronomy worked better if Sun was center of solar system Theorized that the Earth did move Theorized that the Earth did move

4 Galileo ~1600 C.E. ~1600 C.E. Argued that objects only stop moving because of friction Argued that objects only stop moving because of friction Friction: force that opposes movement Friction: force that opposes movement Occurs between two touching objects Occurs between two touching objects :., objects in motion should stay in motion without friction :., objects in motion should stay in motion without friction

5 Inertia Galileo called this idea inertia Galileo called this idea inertia Inertia allows objects to resist changes in motion Inertia allows objects to resist changes in motion

6 Newton ~1700 C.E. ~1700 C.E. Re-stated Galileos ideas in his 1 st law of motion Re-stated Galileos ideas in his 1 st law of motion Objects continue at rest or in a straight line at a uniform speed, unless acted on by a nonzero net force Objects continue at rest or in a straight line at a uniform speed, unless acted on by a nonzero net force Newtons First Law of motion (aka law of inertia) Newtons First Law of motion (aka law of inertia)

7 Vocabulary Friction Friction Inertia Inertia Law of inertia Law of inertia Mass Mass Weight Weight newton newton

8 Objects at rest An object at rest will stay there unless an outside force acts upon it An object at rest will stay there unless an outside force acts upon it That force upsets the equilibrium and will start the object moving That force upsets the equilibrium and will start the object moving

9 Objects in motion Once in motion, the net force becomes zero again Once in motion, the net force becomes zero again Only another force will make it slow down or change direction Only another force will make it slow down or change direction

10 What does the amount of inertia depend on? What does the amount of inertia depend on? Mass Mass

11 Mass is not….. Volume (a large size does not equal a large mass) Volume (a large size does not equal a large mass) Weight (weight depends on gravity, which is different in different places) Weight (weight depends on gravity, which is different in different places)

12 Mass is Inertia Mass is the amount of matter in an object Mass is the amount of matter in an object The more mass, the more inertia an object has The more mass, the more inertia an object has Mass is measured in kilograms (kg) Mass is measured in kilograms (kg) Weight is the force of gravity Weight is the force of gravity Weight is measured in newtons (N) Weight is measured in newtons (N)

13 Relative Motion Does a rock move sideways as it falls? Does a rock move sideways as it falls? Why doesnt it, if the Earth is moving? Why doesnt it, if the Earth is moving?

14 Relative Motion Objects move with the earth Objects move with the earth The rock is moving with the earth as it falls, so it does not seem to move sideways The rock is moving with the earth as it falls, so it does not seem to move sideways

15 Relative Motion

16 High speed vehicles demonstrate this concept. High speed vehicles demonstrate this concept. Dropping a rock in a plane has the same effect. Dropping a rock in a plane has the same effect. The rock moves with the plane The rock moves with the plane


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