Presentation on theme: "Quiz this Friday on Chapter 1.2 – What is a force? motion acceleration Force unbalanced force balanced force net force newton (unit of force)"— Presentation transcript:
Quiz this Friday on Chapter 1.2 – What is a force? motion acceleration Force unbalanced force balanced force net force newton (unit of force)
What should you do? Create flash cards and use randomly Study with a friend Have a parent or friend quiz you Make a mock quiz and give it to a friend Read and reread the section and take notes Use the online textbook Write definitions and recite them out loud Read your own notes and project work Take more notes and listen in class Record yourself asking questions Pretend to be a teacher and instruct yourself Take the online games or quizzes
You should know: A force is a push or pull. Forces Have size Have direction Are expressed in newtons (N)
Forces ACT on Objects Force is always exerted by one object on another. Sometimes forces may not be seen.
Net force is determined by combining forces. Forces in the same direction are added. Force in opposite directions are subtracted.
Balanced forces produce NO change in motion. Unbalanced forces produce a change in motion. Which ones are moving? Check your answers at: (physics classroom) http://www.physicsclassroom.com/Class/newtlaws/u 2l2d.html
If the Net Force is 0 N, what kind of force is it? Balanced Force
What always causes a change in speed, direction or both? Unbalanced forces 45 N 40 N What is the NET Force?
Is the girl accelerating? (She is also going a constant speed.)
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Motion Key Point- What is the reference point? Try this: Find a picture of something and determine if it is moving. Good Link: http://www.phys.lsu.edu/dept/opps/new_page_7.ht m