Ch4_VanMaldenJ

= = toc =**Chapter 4-**=

Lesson 1- (A-D)

 * What are Newton's Laws of Motion?
 * Newton's laws of motion are all the ways in which motion can be explained.
 * What does Newton's first law, the law of inertia, deal with?
 * Newton's first law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. [[image:http://www.physicsclassroom.com/Class/newtlaws/u2l1a1.gif width="296" height="220" align="bottom"]]
 * What is inertia?
 * Inertia is an objects natural tendency to resist changes in their states of motion.
 * What kind of objects have inertia?
 * All objects have inertia, but this tendency varies depending on the mass of an object. So greater objects tend to have a greater resistance then objects with smaller masses.
 * What is considered an unbalanced force?
 * [[image:http://www.physicsclassroom.com/Class/newtlaws/u2l1d3.gif width="309" height="178" align="bottom"]]
 * Because the forces acting upon this book aren't in a state of equilibrium, the object in unbalanced.

Lesson 2- (A-D)
>> >>
 * What is a force? What are the types of force?
 * A force is a push or pull upon an object resulting from the object's interaction with another object. There are two types of forces, a contact force, which is a force that result when the two interacting objects are perceived to be physically contacting each other, or action-at-a-distance forces, which are forces that result even when the two interacting objects are not in physical contact with each other, yet are able to exert a push or pull despite their physical separation.
 * How can the forces be described/ what are they?
 * The force of gravity is always downward, and it is equal to 9.8 N/kg on Earth.
 * The normal force is the support force exerted upon an object in contact with another stable object. It is always perpendicular from whatever is pushing the object.
 * Friction is the force exerted by a surface as an object moves across it or attempts to move across it.
 * Tension is a force that is a pull caused by a rope or chain.
 * What is static and sliding friction?
 * Static Friction- results when the surfaces of two objects are at rest relative to one another and a force exists on one of the objects to set it into motion relative to the other object.
 * Sliding Friction- results when an object slides across a surface
 * What is an example of a free body diagram?
 * What is the net force?
 * The net force is the vector sum of all the forces that act upon an object.

Lesson 3 (A-B)

 * What is Newton's First Law of Motion?
 * This law predicts the behavior of objects for which all existing forces are balanced.
 * The first law - sometimes referred to as the law of inertia- states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s.
 * Objects at equilibrium (the condition in which all forces balance) will not accelerate.
 * An object will only accelerate if there is a unbalanced force acting upon it, whiche will accelerate an object - changing its speed, its direction, or both its speed and direction.
 * What is Newton's Second Law?
 * The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object
 * [[image:Screen_shot_2011-11-27_at_5.02.18_PM.png]]