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Chapter 3 Ah-has!
1. Newton's Laws of Motion are applicable only to macroscopic objects and at speeds that are much lower than the speed of light.
2. There are several different types of friction.
I did not know either of the things above before I read the chapter.

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A lot of things stood out to me.                                       The whole chapter, presented ah ha moments for me. I am realized that Fore changes motion; it doesn't cause motion.  Also, If the net force is double, the acceleration also doubles  and so on.  I am learning that the direction of acceleration is  "ALWAYS" in the direction of the net force.  (when force is applied in direction of the object's motion, the speed increase. When a force is applied in the opposite the direction, the speed decreases.  (I knew that happened, I just didn't understand the concept behind it.) 

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A lot of things stood out to me.                                       The whole chapter, presented ah ha moments for me. I am realized that Fore changes motion; it doesn't cause motion.  Also, If the net force is double, the acceleration also doubles  and so on.  I am learning that the direction of acceleration is  "ALWAYS" in the direction of the net force.  (when force is applied in direction of the object's motion, the speed increase. When a force is applied in the opposite the direction, the speed decreases.  (I knew that happened, I just didn't understand the concept behind it.) 

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I realized that inertia is what causes a heavy object not to move as easy as a lighter object..
This book is a good book to help one understand such complicated concepts. I have to read it many times to get it, but its seems to be coming together.

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1. I didn't fully understand that friction can occur through a liquid as well.  I was thinking of it as 2 solid surfaces rubbing together.

* acceleration is 0 when the velocity is constant
*Objects in Free Fall (without an external force applied) have equivalent acceleration and fall at the same rate
*it was Galileo that developed the concept of acceleration using inclined planes
*objects with more inertia are more resistant to motion
-ex. elephant compared to a feather

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1. I never thought about an object as being "deformed" when a force acts upon the object to change its direction since it is not often visable for that breif moment.

2. Our future depends on humans to have a strong understanding of force and motion to deal with the Earth's constant changes (global warming).

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1. I have been misusing words within my classroom. I am using velocity, speed, and acceleration to loosely.

2. Mass of objects relates to its inertia. In elementary ed we also loosely connect mass, volume, and weight.

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Chapter3 New Ideas
1.Fact- Static friction: has no relative motion.

2. All energys are associated with some type of force  (gravitational, elastic, electrical, chemical)

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Florence Van Buckley.                                        DCI Chapter 3 

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Florence Van Buckley.                                        DCI Chapter 3 

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Two things that stood out to me are:
1. Everything in the world can be explained as an outcome of the interplay of four fundamental forces: electromagnetic force, gravitational force, strong nuclear force, and weak nuclear force.
2. Electric forces are omnipresent: every contact force is actually an electric force, and electric forces hold every substance or object together.

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Brandee Donat.  Chapter 3 what stood out 

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Brandee Donat.  Chapter 3 what stood out 

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The idea that forces and energy are not the same thing.
*forces have directions   Energy doesn't
*forces always come in pairs.  Energy doesn't
* energy can't be created or destroyed   This is not true for forces
Newton's second law the acceleration of an object depends on the net force acting on the object and inversely on the mass of the object
A=F/m

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What stood out:
1. In space it is very difficult to move an anvil due to inertia. In trying to move the anvil, the astronaut would simply end up moving himself. This makes complete sense, but is not something I had given much thought to.
2.Terminal velocity - Prior to starting this class, I would have said about the free falling objects probe that the balls would hit at exactly the same time. Figure 3.20 shows a golf ball and a styrofoam ball both being dropped. It explains that the styrofoam ball, being lighter, is more greatly impacted by air drag and reaches terminal velocity more quickly. I am picturing terminal velocity being reached as the number of air molecules being hit at any given time increases. The heavier an item, the more air molecules need to be hit in a given moment to reach terminal velocity. Neither ball in figure 3.20 is actually smooth, as in the probe, but I wonder if a ping pong ball would not reach terminal velocity faster than some other denser ball. I also read that the dimples in the golf ball actually create turbulence which sucks the air closer to the ball creating less drag. Theoretically a smooth ball encounters more drag and should reach terminal velocity more quickly than ball which is not smooth. I am left with many questions about how air drag impacts objects in the real world. How long does it actually take to reach terminal velocity? Is it longer than the balls would have when falling from the top of the school building?