Transcript What is a force? - South Windsor Public Schools

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?
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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.)
internet study sites
• http://kerala.skoool.in/id274.htm
• http://www.zephyrus.co.uk/forcetypes.html
• http://mansfieldct.org/schools/mms/staff/ha
nd/lawsunbalancedforce.htm
• http://www.slideshare.net/jshinkle/forcemotion
Motion
Key PointWhat 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