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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!.
The Force Is with You. The student will demonstrate an understanding of motion, forces, and energy.
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
Chapter 4.1: Changes in Motion
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.
What is a Force Chapter 1, Sec.2. Force is measured in newtons (N)
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.
Scalar Quantities Measurements that are fully described by a magnitude (or numerical value) alone. Examples: Mass- 70kg Speed- 45mph Distance- 100m.
Chapter 4 Changes in Motion Objectives
Free-Body Diagrams October 31, 2013.
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