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Wed, 12/17 Question 12 on your bellringer sheet.I am collecting these today!!!!!! TO DO TODAY: Review Yesterday Continue Forces/Newton Practice problems with Equilibrium FBDs and Net Force problems
Free Body Diagram Shows all forces (vector) acting on an objectUnit for force = N (Newton) FN = 500 N Fp = 1000 N Ff = 200 N Fg = 500 N
Common Forces Fg = weight downwardFN = normal perpendicular to surface Ff = friction (includes air) opposite to motion Fp = push/pull FT = tension in string FRICTION FN FRICTION Fg
ΣF = (summation) net forceVector sum of all forces on an object ΣF = (summation) net force x and y components: F(x) = F·cos θ F(y) = F·sin θ Fp(y) Fp θ Fp(x)
In-Class Problem #1 A 9 N book sits at rest on a table. ΣF = 0 N
Practice… Draw a free body diagram for the following:A pen is pushed to the left on a table. Fnorm Fpush Ffric Fgrav
Pushing a book across the tableFnorm = Going Up Fappl = You pushing Fgravity = The weight of the object and gravity’s pull Ffriction = Friction
Things to keep in mind… They will NOT always have 4 arrows.“System” can be shown as a box or a dot. (Here it will be shown as a box to make it easier to see)
#1 A book is at rest on a tabletopOnly Fnorm and Fgrav are acting on the book while it sits
Suspended? Ftens and Fgrav#2 A college student rests a backpack upon his shoulder. The pack is suspended motionless by one strap from one shoulder. Suspended? Ftens and Fgrav
#3 A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity.Falling and considering air resistance? Fair
Free Fall, neglect air resistance?#4 An egg is free-falling from a nest in a tree. Neglect air resistance. Free Fall, neglect air resistance? Only force is Fgrav
#5 A girl is suspended motionless from the ceiling by two ropes.Something hung? No Fnorm Ftens (Tension)
#6 A rightward force is applied to a book in order to move it across a desk with a rightward acceleration. Consider frictional forces. Neglect air resistance
#7 A rightward force is applied to a book in order to move it across a desk at constant velocity. Consider frictional forces. Neglect air resistance.
#8 A skydiver is descending with a constant velocity#8 A skydiver is descending with a constant velocity. Consider air resistance.
#9 A force is applied to the right to drag a sled across loosely packed snow with a rightward acceleration.
Question O’ The Day What is a force?
FORCES and Newton’s 1 st Law. A force is a push or pull on an object which can cause the motion of the object to change. Forces cause accelerations! If.
Newton’s Laws Easy as apple pie!.
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Please turn in your week 6 accountability sheet and pick up week 7. If you did not bring your workbook, share with a table partner.
Forces and Freebody Diagram Notes
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Force and Its Representation Drawing Free- Body Diagrams Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces.
Forces A box is being pulled across a surface by a horizontal rope. The force: applied by the rope is called _________. resisting the motion is called.
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Free-body diagrams Free-body diagrams are pictures that show the size and direction of all forces acting on an object.
AP Physics B Summer Course 年 AP 物理 B 暑假班 M Sittig Ch 10: Free Body Diagrams and Equilibrium.
Do Now: Do Now: 1. What is the formula to calculate weight? 1. What is the formula to calculate weight? 2. A. Draw the resultant force and calculate it.
Review: Newton’s 1 st Law An object in motion stays in motion in a straight line, unless acted upon by unbalanced force. A push or pull will cause object.
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