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Force & Motion

Force & Motion. NOTES 3 : Drawing a Force Diagram (AKA Free body Diagram). WHAT IS A FORCE DIAGRAM?. A simple, labeled diagram that shows the forces acting on an object as arrows that indicate the magnitude and direction of the force. 2N. 5N. VOCABULARY.

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Force & Motion

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  1. Force & Motion NOTES 3: Drawing a Force Diagram (AKA Free body Diagram)

  2. WHAT IS A FORCE DIAGRAM? • A simple, labeled diagram that shows the forces acting on an object as arrows that indicate the magnitude and direction of the force. 2N 5N

  3. VOCABULARY Force diagrams require a knowledge of the following: • MAGNITUDE • DIRECTION • NET FORCE • And a review of… • NewtonBalanced forcesUnbalanced forces

  4. MAGNITUDE • The amount of force applied to an object; the higher the force, the greater the magnitude

  5. DIRECTION • Um, duh? • The place towards which an applied force is pushing or pulling an object On a force diagram, the direction is indicated by an arrow. The arrow points in the direction the force is moving the object.

  6. NET FORCE • The combined force (magnitude and direction) acting on a object.

  7. NEWTON (N) • the SI (standard international) unit for force • Equal to: • 1 kg x 1m/s2

  8. BALANCED FORCES • When the magnitude and direction of more than one force acting on an object results in a net zero force

  9. UNBALANCED FORCES • When the magnitude and direction of more than one force acting on an object results in a net force unequal to zero

  10. HOW TO DRAW A FORCE DIAGRAM • Draw a square, rectangle, or circle to represent the object the force will be acting upon. • Label the object!! • Draw ONE arrow for each force that is acting upon the object. • The size of the arrow reflects the magnitude of the force. • The direction of the arrow shows the direction that the force is acting. • Label each arrow you’ve drawn with the magnitude of the force.

  11. PRACTICE 1 • A book is resting on a tabletop. The book sits on the table with 5N worth of force.

  12. PRACTICE 1 5N • What is the net force? 0 (zero) • Does the book move? No (the book is at rest) book 5N

  13. PRACTICE 2 • Marissa and Nadia are playing tug of war. Marissa pulls the rope with 3N of force and Nadia pulls the rope with 4N of force.

  14. PRACTICE 2 • What is the net force? • 1N to the right (the 3N of force in opposite • directions cancel other out leaving only 1N to the right) • Who wins the tug-of-war? • Nadia rope 4N 3N

  15. ALRIGHTY THEN… IF MORE THAN ONE FORCE ACTS ON AN OBJECT ALON G A STRAIGHT LINE, THE FORCES WILL REINFORCE OR CANCEL EACH OTHER OUT – DEPENDING ON THE DIRECTION AND MAGNITUDE OF THE FORCES.

  16. UNBALANCED FORCES • Unbalanced forces result in nonzero net forces that will cause a change in speed or direction (or both) of the object’s motion. • In which examples were their nonzero net forces? • What happened to the speed/direction in those examples?

  17. REINFORCE • The net force is twice what either force would be alone. They combine forces (Ha Ha!) because they are acting upon the object in the same direction. 10N NET FORCE : 15N to the right 5N

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