**Chapters 2, 3, 4, and 5 **

*Inertia* - The sluggishness
or apparent resistance on object offers to changes in it state
of motion.

*Speed* - The distance traveled
per time.

(1)

*Velocity* - The speed of
an object and specification of its direction of motion.

(2)

If the acceleration is constant for an object, then …

(3)

*Acceleration* - The rate
at which velocity changes with time; the change in velocity may
be in magnitude or direction or both.

(4)

*Free Fall* - A state of fall free from air
resistance and other forces except gravity.

During free fall….

acceleration = g = 9.8 m/s^{2}

velocity = v = g t (5)

(6)

*Newton's First Law* - an object will remain
at rest, or in uniform motion in a straight line, unless acted
upon by a force.* *

* *

*Newton's Second Law* -
the acceleration of an object is given by

* *

*Newton's Third Law* - For every action there
is an equal and opposite reaction.*
*

*Mass* - The quantity of
matter in an object. It is the measurement of the inertia or
sluggishness that an object exhibits in response to any effort
made to start it, stop it, or changes in any way its state of
motion.

*Weight* - The force due
to gravity on an object.

*Kilogram* - A fundamental
unit of mass (symbol kg).

*Newton* - A unit of force.
One Newton (symbol N) is the force that will give an object of
mass 1 kg an acceleration of 1 m/s^{2}.

*Force* - Any influence
that can cause an object to be accelerated; measured in Newtons
in the metric system and pounds in the British system.

*Mechanical equilibrium*
- The state of an object for which all forces cancel to zero and
no acceleration occurs.

*Friction* - The resistive
forces that arise to oppose the motion of an object.

*Terminal Velocity* - The speed
at which the acceleration of a falling object terminates because
friction balances the weight.

*Vector quantity* - A quantity
that has both magnitude and direction. Examples of vector quantities
are force, velocity, and acceleration.

*Scalar quantity* - A quantity
that has magnitude, but not direction. Examples of scalar quantities
are mass and speed.

*Vector* - An arrow drawn
to scale used to represent a vector quantity.

*Resultant* - The net result
of a combination of two or more vectors.

*Projectile* - Any object
that is projected by some for and continues in motion by virtue
of its own inertia.

*Parabola* - The curved
path followed by a projectile under the influence of gravitational
attraction only.

**How to Study**

* 1. Review homework questions. Take the practice exam.*

* 2. Review the Summary of Terms section at the end of each
chapter.*

* 2. Review the questions in blue throughout the chapters.*

* 3. Study each picture in the chapters and read their captions.*

* 4. Reread the chapters.*

* 5. More advice.*