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Chapter 3

Newton’s Law

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Newton’s First Law

Law of Inertia

Newton’s Second Law

F = ma

Newton’s Third Law

Action Reaction

Law of Universal Gravitation

Slide 3

…is measured in kilograms.

…is the measure of the inertia of an object.

Inertia is the natural tendency of a body resist changes in motion.

Slide 4

…the agency of change.

…changes the velocity.

…is a vector quantity.

.measured in Newton’s.

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Law of Inertia

“A body remains at rest or moves in a straight line at a constant speed unless acted upon by a force.”

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Newton’s First Law

No mention of chemical composition

No mention of terrestrial or celestial realms

Force required when object changes motion

Acceleration is the observable consequence of forces acting

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The Sum of the Forces acting on a body is proportional to the acceleration that the body experiences

F a

S F = (mass) a

Slide 8

Net Force

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Action-Reaction

For every action force there is an equal and opposite reaction force

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Every mass exerts a force of attraction on every other mass.

The math…

G = 6.67 10-11 N·m2/kg2

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Did the Moon exert a gravitational force on the Apollo astronauts?

What kind of objects can exert a gravitational force on other objects?

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Gravity Questions

The constant G is a rather small number. What kind of objects can exert strong gravitational forces?

If the distance between two objects in space is doubled, then what happens to the gravitational force between them?

Slide 13

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- Newton’s Laws
- Mass
- Force
- Newton’s First Law
- Newton’s Second Law
- Newton’s Third Law
- The Law of Gravity
- Gravity Questions
- Weight
- Tension (Tensile Force)
- Normal Force
- Coefficient of Friction

- Ch 9 Nuclear Radiation
- Motion
- Space Radiation
- Health Physics
- Soil and Plant Nutrition
- Sound
- Geophysical Concepts, Applications and Limitations

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