Ch4_CantorA

toc

=Homework =

Lesson 1 (a-d) 11/14
I chose to talk out Newton's First Law of Motion with my parents.
 * 1) What is Newton's First Law of Motion?
 * 2) Newton's first law of motion 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
 * 3) No change in motion unless an unbalanced force acts upon it... otherwise it will move at constant speed in a straight line.
 * 4)  This is referring to two different states: rest and motion.
 * 5) What are inertia and mass?
 * 6) Inertia is the resistance an object has to change in it's state of motion
 * 7) Mass is the quantity that is solely dependent on the inertia of an object. A more massive object has a great tendency to resist change in its state of motion.
 * 8) It measures how difficult it is to change an objects motion (depending on its mass)
 * 9) What is meant by the phrase state of motion?
 * 10) The state of motion of an object is defined by its velocity (magnitude + direction.)
 * 11) Therefore, inertia can mean the tendency of an object to resist change in its velocity
 * 12) OR, the tendency of an object to resist accelerations (when an object is at constant motion)
 * 13) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">How do balanced and unbalanced forces pertain to Newton's First Law?
 * 14) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">If all forces act upon each other remain in equilibrium (as determined by a FBD), then the object will not change its original state.
 * 15) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">dynamic equilibrium is at constant speed
 * 16) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">static equilibrium is at rest and there is no motion
 * 17) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">However, if they are unbalanced (again, determined by a FBD) the object will CHANGE its state.

<span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Lesson 2 (a-d) 11/15
<span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">I chose to ask my parents these very questions and discuss the importance of them while we ate dinner last night.
 * 1) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">What is the meaning of force?
 * 2) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">A force is a push or a pull upon an objecting resulting from the object's interaction with another object.
 * 3) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">There two categories: contact forces and action-at-adistance forces.
 * 4) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">What are different types of forces?
 * 5) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Contact forces are the following: frictional, tension, normal, air resistance, applied, and spring force.
 * 6) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">frictional: sliding and static friction are the two types; they normally oppose the motion of an object; sliding is when an object slides and static is when objects are at rest and a frictional force still exists between
 * 7) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">tension: a pull force on the object
 * 8) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">normal: the support force that occurs between an object in contact with another stable object
 * 9) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">air resistance: opposes the motion of an object as it travels through the air
 * 10) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">applied: force applied by another person or object
 * 11) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">spring: compressed or stretched force attached to an object
 * 12) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Action-at-a-distance forces are the following: gravitational, electrical, and magnetic.
 * 13) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">gravitational: when a large mass (moon, earth) attracts other objects towards itself; aka weight of the object
 * 14) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">So what is the difference between mass and weight?
 * 15) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Weight is the gravitational pull on an object based on mass (N)
 * 16) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Weight= mg (mass times gravity)
 * 17) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Mass is the actual make up of the object (kg)
 * 18) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">What is a Free Body Diagram?
 * 19) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">FBD show the relative magnitude and direction of different forces acting upon a system
 * 20) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">These can be used to determine unbalanced and balanced forces
 * 21) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">How can you determine the net force?
 * 22) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">The net force is the vector sum of all the forces that act upon an object
 * 23) <span style="color: #000000; font-family: 'Trebuchet MS',Helvetica,sans-serif;">ΣF <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;"> is the equation for net force

<span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Lesson 3 (a+b) 11/17
<span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Jessica and I had a conversation regarding the Big Misconception and talked about how another force is necessary to change an objects state of motion. By doing this, we helped each other understand the situation better.
 * 1) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">What is Newton's Second Law of Motion?
 * 2) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Newton's Second Law of Motion states that the acceleration of an object has two components, the mass of the object and the net force of the object.
 * 3) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">The equation is a= Fnet/ m.
 * 4) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.
 * 5) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Does sustaining motion require a continuous force?
 * 6) <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Newtown's Law declares that a constant force is not necessary to keep an object in motion. It is an unbalanced force, per say, friction, that will cause an object to slow; this would demonstrate an application of inertia.

<span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Lesson 3 (Vectors) 12/6

 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">addition of Forces
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">the goal is to determine the net force
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">head to tail addition of the arrows
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">the net force is not always zero
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Resolution of Forces
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">there can be different components of a force, depending on if there is an angle
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">trigonometric functions can be used to determine the resultant of the force
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">force example, this method could be applied to recreational sailboating
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">equilibrium and statics
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">when all the forces acting upon an object are equal, they are said to be in equilibrium (different axises though)
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">horizontal and components
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">The principle is that as the angle with the horizontal increases, the amount of tensional force required to hold the sign at equilibrium decreases
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">net forces
 * a force directed at an angle to the horizontal can be resolved into two components
 * together, two components are a replacement for the single force
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">tilted surfaces
 * the rate at which an object with slide down an inclined plane is dependent on how steep it is
 * a= gsin(theta)
 * the process of analyzing the forces acting upon objects on inclined planes will involve resolving the weight vector (Fgrav) into two perpendicular components.
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">two dimensional diagrams (2 body problems
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">typically involve solving for the acceleration of the objects and the force that is acting between the object
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">examples are trains, Atwoods equations, drop and pull problems

=<span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Class Notes =

<span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Force
<span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Newton's First Law <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Inertia <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Weight <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Balanced vs. Unbalanced <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Newton's Second Law <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Net Force
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">states that there no change in motion unless an unbalanced force acts on the object
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">otherwise it will move at constant speed in a straight line
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">property that measures how difficult it is to change an object's motion
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">measured by massmass is measured in kg
 * the more mass something has the harder it is to change the motion
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">a force, is the pull of gravity on a mass
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">measured in Newtons (N)
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">a = 9.8 m/s/s
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">weight can change based on the gravitational pull of the planet
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">W= M x g (mass times gravity)
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">N=W, then balanced
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">Equilibrium (two types)
 * static
 * at rest
 * no motion
 * dynamic
 * constant speed
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">when an unbalanced force acts on an object, it will accelerate in the direction of the unbalanced force
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">if N > W, a is upward
 * can be velocity and acceleration both going up and in this case you are speeding up
 * if velocity is going downward and acceleration is going up, then you are decreasing speed
 * BOTH have the same direction which is normal being greater than weight
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">the difference between two unbalanced forced
 * <span style="font-family: 'Trebuchet MS',Helvetica,sans-serif;">symbol: ΣF