Thursday (Sep 23):

 Test Today: L 1-6

Key Concept(s) Today: History of Motion -Aristotle, Copernicus, Galileo

Newton’s Three Laws Learning Objectives:

• Differentiate between mass and weight and the relationship with gravity
• Differentiate between force, displacement, distance, inertia, speed, velocity and  acceleration.
• Be aware of major historical individuals and their contribution to the concept of motion.
• Demonstrate proficiency in solving problems using displacement, distance, inertia, speed, velocity and average acceleration.
• Measure and describe the sum of all the forces acting on an object.
• Analyze the effects of balanced and unbalanced forces on the motion of an object
• Predict & analyze motion of an object based on inertia and forces (balanced and unbalanced)
• Describe and analyze how forces (contact & field) interact between objects
• Analyze how physical, conceptual, and/or mathematical models represents and are used to investigate objects, events, systems and processes.  
• Demonstrate understanding of Free Body Diagrams by drawing Free Body diagrams for static, constant velocity and accelerated motion for single bodies and multiple attached bodies.
• Demonstrate proficiency in solving problems using Newton’s 1^st, 2^nd, & 3^rd, Laws of Motion

• Generate and evaluate questions that can be answered through scientific investigations.
• Apply understanding by planning, conducting, reporting and evaluating  systematic and complex scientific investigations of objects, events, systems, and/or processes.
• Revised a scientific explanation using additional/new evidence, data, and inferential logic.  
• Analyze local, regional, national, or global problems or challenges in which scientific design, technology or engineering can be or has been used to find a solution.

Journal:

What is motion and who defined it?

True or False (if False, Explain why it is wrong)

1. If an object is moving, something has to be pushing it.

2. If you apply a constant force to an object, it will move with constant velocity.

3. If  no force acts on it, a moving object will eventually stop.

4. Inertia is a force.

Key Concept's) Today: 2nd Law, Unbalanced Force & Free Body

Newton’s Three Laws Learning Objectives:

• Differentiate between mass and weight and the relationship with gravity
• Differentiate between force, displacement, distance, inertia, speed, velocity and  acceleration.
• Be aware of major historical individuals and their contribution to the concept of motion.
• Demonstrate proficiency in solving problems using displacement, distance, inertia, speed, velocity and average acceleration.
• Measure and describe the sum of all the forces acting on an object.
• Analyze the effects of balanced and unbalanced forces on the motion of an object
• Predict & analyze motion of an object based on inertia and forces (balanced and unbalanced)
• Describe and analyze how forces (contact & field) interact between objects
• Analyze how physical, conceptual, and/or mathematical models represents and are used to investigate objects, events, systems and processes.  
• Demonstrate understanding of Free Body Diagrams by drawing Free Body diagrams for static, constant velocity and accelerated motion for single bodies and multiple attached bodies.
• Demonstrate proficiency in solving problems using Newton’s 1^st, 2^nd, & 3^rd, Laws of Motion

• Generate and evaluate questions that can be answered through scientific investigations.
• Apply understanding by planning, conducting, reporting and evaluating  systematic and complex scientific investigations of objects, events, systems, and/or processes.
• Revised a scientific explanation using additional/new evidence, data, and inferential logic.  
• Analyze local, regional, national, or global problems or challenges in which scientific design, technology or engineering can be or has been used to find a solution.

Journal:

1. What is the relationship between unbalanced forces, acceleration, net force and D velocity?

2. If velocity is zero, then acceleration must be zero too. Explain what you think.

3. Find:    T₁ &  T₂

                                          T₁

                                            30⁰                        T₂

                             100N

   x direction:      (Cos 30⁰)(T₁)  = T₂

                           .87T_{1   =} T₂

  y direction:      (Sin 30⁰)(T₁)  = 100

                             .5T₁   =  100

                              T₁   =  100/.5  = 200N      

                                            T₂   = .87T₁  

                                       T₂   =  (.87)(200N) = 173N

Turn in L#5

 L#7:  1-3, 7 - 14, 17   Due Friday 25 Sep (Motion & Avg Acceleration)

 L #8: 1- 7, 12, 15, 18    Due Monday 28 Sep  (Friction)

L #10: 1- 3, 7 - 10, 14, 17    Due Wed 30 Sep (Motion Graphs)

L #11:  1- 4, 9, 11,  13, 15, 18 Due Monday 5 Oct (Newton's 2nd & 3rd)

L #14:  1- 3, 5, 10, 11, 14 Due Wed 7 Oct  (Free Body)  

   Balanced forces:

Block moving at constant velocity.

I

 

 

 

 

 

Unbalanced force:

In the statement of Newton's first law, the unbalanced force refers to that force which does not become completely balanced (or canceled) by the other individual forces. If either all the vertical forces (up and down) do not cancel each other and/or all horizontal forces do not cancel each other, then an unbalanced force exists. The existence of an unbalanced force for a given situation can be quickly realized by looking at the free-body diagram for that situation. Free-body diagrams for three situations are shown below. What is the acceleration in each case?

 

 

What is the Net Force in each of the following cases?

             Acceleration of - 4 m/s²

Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables - 1.   net force acting upon the object, and

2.  inversely upon the mass of the object.

2nd Law Quiz:

http://www.batesville.k12.in.us/Physics/PhyNet/Mechanics/Newton2/Second_Law_Quiz.html#concept%20quiz

http://www.batesville.k12.in.us/Physics/PhyNet/Mechanics/Newton2/Second_Law_Quiz.html#numerical%20quiz