Lecture 9 – Motion and Gravity, Part 1/2
Summary / Checklist of the Main Concepts to Understand and Remember

Newton's Laws of Motion  
What is inertia?  
According to Aristotle, what does it take for an object to keep moving at a constant speed in a given direction?  
According to Newton's laws, what does it take for an object to keep moving at a constant speed in a given direction?  
red bullet What do Newton's laws say about the motion of an object on which no net force is acting?  
red bullet What is mass, and how does it differ from weight?  
red bullet Can an object have no mass, or no weight? (If yes, explain when; If no, explain why.)  
What do Newton's laws say about the motion of an object on which a net force is acting?  
What do Newton's laws say about two objects when they interact, and one of them feels a force due to the other one?  
Is the force acting on an object directly related to how fast that object is moving?  
Does a satellite in orbit around the Earth hundreds of miles above the surface need a force to push it along the orbit?  
     
The Sky in September  
The Summer Triangle: The three stars that form it, and their constellations.  
     
     
     

Topics from the lecture page and textbook not listed above [or between square brackets] were not covered in class;
Underlined words indicate that I will expect students to remember a number or a name related to that topic.

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