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Net Force

Net Force. Force Diagram. A force diagram is a picture that shows how a force is acting on an object. Force diagrams shows each force as an arrow pushing or pulling on the object and a number showing the magnitude (aka size). 5 N. Object. Force Diagram Practice.

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Net Force

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  1. Net Force

  2. Force Diagram • A force diagram is a picture that shows how a force is acting on an object. • Force diagrams shows each force as an arrow pushing or pulling on the object and a number showing the magnitude (aka size). 5 N Object

  3. Force Diagram Practice Using the diagram below, find each piece of information. • Push or pull? • Direction the object is moving • The amount of force being applied to the object with units • The object Push To the left 3 Newtons 3 N A cow!

  4. Net Force • If more than one force acts on an object, it is possible to calculate the total or net force on the object. • These forces can either work together or against each other.

  5. Additive Net Force • If the forces are going in the same direction, then they work together. • The net force is the sum of the individual forces. Individual Forces Net Force 5 N 8 N 3 N

  6. Subtractive Net Forces • If the forces are going in opposite directions, then the forces are working against each other. • The net force is the difference between the individual forces. Individual Forces Net Force 5 N 3 N 2 N

  7. Unbalanced Net Force • When the net force on an object is not zero, then the forces acting on that object are unbalanced. • Unbalanced forces change the motion (speed or direction) of an object. 3 N 4 N 7 N

  8. Balanced Net Forces • When the net force on an object is zero, then the forces acting on that object are balanced. • Balanced forces do not affect the motion of the an object. • Balanced forces must be equal in magnitude but opposite in direction. 4 N 4 N 0 N

  9. Practice 1 You push on a book with a force of 10 N and Chris pushes on the book but against you with a force of 10 N. • Draw a force diagram. • Determine the net force. • Decide if the forces are balanced. 10 N 10 N Net Force: 10 N – 10 N = 0 N Balanced!

  10. Practice 2 The blue team pulls on the rope with a force of 55 N while the red team pulls against them with a force of 45 N. • Draw a force diagram. • Determine the net force. • Decide if the forces are balanced. 55 N 45 N Net Force: 55 N – 45 N = 10 N Unbalanced!

  11. Practice 3 2 N A man pushes down on a button with a force of 2 N while gravity pulls on it with a force of 6 N. • Draw a force diagram. • Determine the net force. • Decide if the forces are balanced. 6 N Net Force: 2 N + 6 N = 8 N Unbalanced!

  12. Practice 4 Label each image as an example of a balanced or unbalanced force: Unbalanced Balanced Unbalanced

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