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CCSS: P.4E: Develop and interpret
free-body force diagrams
By the end of today, IWBAT…
Develop and interpret free-body diagrams
Essential Question:
How do I visually represent forces?
Topic:Free-Body Diagrams
Why it matters in LIFE:You already know how to calculate an object’s motion – now we are going to learn about WHY objects move
Why it matters in THIS CLASS: Our Goal = 80%Mastering today’s lesson (focused participation, asking questions, etc) is the first brick that will help us reach our goal for this unit, and eventually for the year
By the end of the day today, IWBAT…• Develop and interpret free-body diagrams
Quick Checks
What is net force? What is true about net force when all the
forces acting on an object are balanced? What does this mean for the motion of the
object? What is true about net force when all the
forces acting on an object are unbalanced? What does this mean for the motion of the
object?
Quick Checks
What is friction? How do you know that friction must be a
force? What is gravity? How do you know that gravity must be a
force? What is normal force?
What is a free-body force diagram?
Force is a vector quantity Therefore, the effect of a force depends on its
magnitude and direction We can draw forces as vectors ( ) to
help us break down all the different forces that are acting on an object
Free body diagram = A diagram of an object that shows the size and direction of all forces acting on it
How do we develop a free-body force diagram?
Force of Gravity
Force of the horse
Force of Ground (Normal Force)
FN
FF
Fg
Force of Friction
FA
How do we develop a free-body force diagram?
Use these questions each time Is there gravity? Fg Is the object on a surface? FN Is the object being pulled or pushed? Fa Is there friction? Ff Which way are all of these forces pulling
the object?
Draw the free-body diagram of a soccer ball being kicked
What are the forces on the football? Which way should the forces be drawn?
Draw the free-body diagram of a soccer ball being kicked
What are the forces on the football? Which way should the forces be drawn?
Force of GravityFG
FA
Force of Kick
Force of Ground (Normal Force)FN
Practice Finding the Net Force
Net Force:
__________
__________
BALANCED or UNBALANCED?
0 N No
direction
Practice Finding the Net Force
Net Force:
__________
__________
0 N
No direction
BALANCED or UNBALANCED?