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### Grade 11, U1B-L3, FBD's & Components

• 1. Lesson 3Lesson 3 Force Components,Force Components, Free Body Diagrams, andFree Body Diagrams, and Newton’s First Law of MotionNewton’s First Law of Motion Rules for drawing FBD’sRules for drawing FBD’s Nelson TB Reference Pages:Nelson TB Reference Pages: 114, 117-120, 123 -126114, 117-120, 123 -126
• 2. Breaking a Force Vector intoBreaking a Force Vector into TwoTwo ⊥⊥ Component VectorsComponent Vectors U P W E 3 0 0F = 30.0 N [ E30 0 UP ]  In the first diagram we have the force that we are going toIn the first diagram we have the force that we are going to break into an east and an up component by usingbreak into an east and an up component by using trigonometry.trigonometry.  It is wise toIt is wise to remember that the horizontal component (east)that the horizontal component (east) is obtained by multiplying the original force (F) by cosis obtained by multiplying the original force (F) by cosθ,θ, where θ is thewhere θ is the ∠∠ betweenbetween FF and the east component.and the east component. 3 0 0F = 30.0 N [ E30 0 UP ] F E a s t = 3 0 .0 C o s 3 0 0 = 2 6 .0 N Fup=30.0Sin300 =15.0N E U p
• 3. Free Body Diagrams (FBD’S)  FBD’s are a very easy way to perform forceFBD’s are a very easy way to perform force analysis on an object. On the FBD we show allanalysis on an object. On the FBD we show all forces acting on an object. We then add theseforces acting on an object. We then add these forces together to determine the total of netforces together to determine the total of net force (Fforce (Fnetnet) which can be) which can be equal to zero, or not!  It is important to remember that if FIt is important to remember that if Fnetnet = 0, the= 0, the object may be at rest or moving with uniformobject may be at rest or moving with uniform motion (recall Galileo’s thought exp’t).motion (recall Galileo’s thought exp’t).
• 4.  Example: A boy is pulling a rope attached to a box asExample: A boy is pulling a rope attached to a box as shown in the initial diagram with a force of 60.0 N [30shown in the initial diagram with a force of 60.0 N [3000 up from horiz]. If the box is moving withup from horiz]. If the box is moving with uniform motionuniform motion,, determine:determine:  FFNN, F, Fff, µ and the type of friction acting, µ and the type of friction acting  Solution: The first step is to draw a FBD. To makeSolution: The first step is to draw a FBD. To make calculations easier we will immediately break the 60.0 Ncalculations easier we will immediately break the 60.0 N force into two components, and calculate Fforce into two components, and calculate Fgg.. 1 0 .0 k g D O M F g = 9 8 .1 N 5 2 .0 N 3 0 .0 N F N = 6 8 .1 N F k = 5 2 .0 N
• 5.  The 60.0 N force is broken into two componentsThe 60.0 N force is broken into two components 30.0 N and 52.0 N. F30.0 N and 52.0 N. Fgg is also placed on theis also placed on the FBD.FBD.  The box is moving with uniform motion so theThe box is moving with uniform motion so the horizontal forces must cancel this means Fhorizontal forces must cancel this means Fkk isis equal to 52.0 N and is in the opposite directionequal to 52.0 N and is in the opposite direction to the 52.0 N component of Fto the 52.0 N component of FAA  Vertical forces must also cancel so FVertical forces must also cancel so FNN mustmust equal | Fequal | Fgg | - 30.0 N = 68.1 N| - 30.0 N = 68.1 N  There is no net force; all horizontal and verticalThere is no net force; all horizontal and vertical forces cancel (or we can say these forces areforces cancel (or we can say these forces are balanced).balanced).  µµkk = F= Fkk/F/FNN = (52.0N)/(68.1N)=0.764= (52.0N)/(68.1N)=0.764
• 6. Rules for Drawing FBD’s 1.1. You may use a dot or a box to represent theYou may use a dot or a box to represent the object.object. 2.2. ShowShow onlyonly the forces actingthe forces acting onon the object, butthe object, but show allshow all the forces acting on the object.the forces acting on the object. 3.3. All force arrows are drawnAll force arrows are drawn outout of the box (orof the box (or the dot) and the arrow lengths must representthe dot) and the arrow lengths must represent the magnitude of the force.the magnitude of the force. 4.4. You may show the components of a force, orYou may show the components of a force, or the actual force.the actual force. 5.5. Label all forces with magnitudes and namesLabel all forces with magnitudes and names (F(Fgg, F, FNN, etc), etc) 6.6. Add any missing forces; such as FAdd any missing forces; such as FNN and Fand FKK
• 7. Newton’s First Law (Galileo’s Principle of Inertia)  An object at rest, or moving with uniformAn object at rest, or moving with uniform motion,motion, will maintain its current state ofwill maintain its current state of motionmotion (being at rest or moving with(being at rest or moving with uniform motion). For this to be true, thereuniform motion). For this to be true, there must bemust be NONO net force (or unbalancednet force (or unbalanced force) acting on the object.force) acting on the object.  (Newton was born the same year Galileo(Newton was born the same year Galileo died (1642).)died (1642).)
• 8. Practice Questions  Work book Page 26Work book Page 26 (New pg 27) - all parts –- all parts – FBD’s, 1st Law  WB pg 33WB pg 33 (New pg 35) (left side only)(left side only) #1,2,3,4,6,9,10 -#1,2,3,4,6,9,10 -FBD’s, 1st Law  WB pg 25WB pg 25 (New pg 26) – all parts– all parts –– drawing FBD’s There are a lot of questions, and we will spend more than one day working on these!