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2.1 Force

2.1 Force. What is a force?. Measured quantity Force. SI Unit Newton. Symbol N. A force is a push or a pull. 2.1 Force. Net Force. The combination of all forces acting on an object is called the net force. 2.1 Force.

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2.1 Force

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  1. 2.1Force • What is a force? Measured quantity Force SI Unit Newton Symbol N A force is a push or a pull.

  2. 2.1Force Net Force The combination of all forces acting on an object is called the net force.

  3. 2.1Force An unbalancedforce is needed to change an object’s state of motion. A force is a push or a pull.

  4. 2.1Force Balanced vs. Unbalanced Force Balanced force occurs when the net force = 0 N (the object experiences no change in motion) Unbalanced force occurs when the net force > 0 N (the object experiences a change in motion) • It takes an unbalanced force to change the motion of an object!

  5. 2.1Force Normal Force Net Force When the girl holds the rock with as much force upward as gravity pulls downward, the net force on the rock is zero. • Fnorm = Fgrav Gravity

  6. 2.1Force Net Force The net force depends on the magnitudes and directions of the applied forces. • The blue arrows are called vectors (they indicate size and direction)

  7. 2.1Force Net Force The net force depends on the magnitudes and directions of the applied forces. • The blue arrow in the net force column is a type of vector called the resultant (5 N + 10 N = 15 N)

  8. 2.1Force Net Force The net force depends on the magnitudes and directions of the applied forces.

  9. 2.1Force Net Force The net force depends on the magnitudes and directions of the applied forces. • 10 N – 5 N = net force of 5 N to the right

  10. 2.1Force Net Force The net force depends on the magnitudes and directions of the applied forces.

  11. 2.1Force Net Force The net force depends on the magnitudes and directions of the applied forces. • 5 N – 5 N = net force of 0 N …which is equilibrium!

  12. 2.1Force Force Vectors can be drawn to scale This vector represents a force of 60 N to the right. N • Vectors show magnitude (size) and direction

  13. 2.1Force How can you change an object’s state of motion? • Apply a net force greater than zero.

  14. Mechanics The study of energy and forces and the effect they have on bodies.

  15. An object in mechanical equilibrium is stable, without changes in motion.

  16. Things that are in balance with one another illustrate equilibrium. Things in mechanical equilibrium are stable, without changes of motion. The rocks are in mechanical equilibrium. • http://library.thinkquest.org/27638/leaning.html

  17. http://video.google.com/videosearch?q=leaning+tower+of+pisa&emb=0&aq=0&oq=leaning+tower+of+#http://video.google.com/videosearch?q=leaning+tower+of+pisa&emb=0&aq=0&oq=leaning+tower+of+#

  18. http://sciencefair.math.iit.edu/projects/pisa/ • An object will fall if its center of mass is no longer situated within its base

  19. http://video.google.com/videosearch?q=leaning+tower+of+pisa&emb=0&aq=0&oq=leaning+tower+of+#http://video.google.com/videosearch?q=leaning+tower+of+pisa&emb=0&aq=0&oq=leaning+tower+of+#

  20. http://www.travelblog.org/Europe/Italy/Tuscany/Pisa/blog-403600.htmlhttp://www.travelblog.org/Europe/Italy/Tuscany/Pisa/blog-403600.html

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