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PHYSICS
2 2 Motion
Information about the mass of a hot air balloon and forces on it will enable you
to predict if it is going to move up, down, or drift across the surface. This chap-
ter is about such relationships among force, mass, and changes in motion.
CORE CONCEPT
A net force is required for any change in a state of motion.
OUTLINE
2.1 Describing Motion
2.2 Measuring Motion
Speed
Velocity
Forces Acceleration
Inertia is the tendency of an Science and Society: Transportation
object to remain in unchanging and the Environment
Forces
motion when the net force is zero.
2.3 Horizontal Motion on Land Falling Objects
2.4 Falling Objects
A Closer Look: A Bicycle Racer’s Edge The force of gravity uniformly
2.5 Compound Motion accelerates falling objects.
Newton’s First Law of Motion Vertical Projectiles
Every object retains its state Horizontal Projectiles
of rest or straight-line motion A Closer Look: Free Fall
unless acted upon by an 2.6 Three Laws of Motion
unbalanced force. Newton’s First Law of Motion Newton’s Second Law of Motion
Newton’s Second Law of Motion The acceleration of an object
Weight and Mass depends on the net force applied
Newton’s Third Law of Motion Newton’s Third Law of Motion and the mass of the object.
A single force does not exist by 2.7 Momentum
itself; there is always a matched Conservation of Momentum
Impulse
and opposite force that occurs at 2.8 Forces and Circular Motion
the same time. 2.9 Newton’s Law of Gravitation Newton’s Law of Gravitation
Earth Satellites All objects in the universe are
A Closer Look: Gravity Problems attracted to all other objects in
Weightlessness the universe.
People Behind the Science: Isaac Newton
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