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Physics Day 42 – FBD

Physics Day 42 – FBD. -LO: FBD with numbers -LO: FBD for Static problems AGENDA Do Now Finish WS1 Notes. Do Now – 1. Please draw a Free Body Diagram of a 5kg book lying on a table being pulled by a string to the right with a force of 3N. (not moving). What is force do?.

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Physics Day 42 – FBD

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  1. Physics Day 42 – FBD -LO: FBD with numbers -LO: FBD for Static problems AGENDA Do Now Finish WS1 Notes Do Now – 1. Please draw a Free Body Diagram of a 5kg book lying on a table being pulled by a string to the right with a force of 3N. (not moving)

  2. What is force do? • How do we change motion in velocity or only direction? Why some objects accelerate at higher rates than others do? • A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. • Forces cause changes in velocity over time, or accelerations.

  3. Type of forces • Contact Forces • Frictional Force • Tension Force • Normal Force • Air Resistance Force • Applied Force • Spring Force

  4. Type of forces • Action-at-a-Distance Forces • Gravitational Force • Electrical Force • Magnetic Force

  5. Normal Forces Physics Book Table

  6. Normal Forces a = 0 Physics Book Table Fn Fg

  7. Friction The force of friction is zero because the book is not trying to slide in any direction. If you put a friction force in, it would be unbalanced and cause an acceleration (and that never happens) a = 0, v = 0 Physics Book Table Fn Fg

  8. Friction String tied to book Physics Book Table

  9. Friction String tied to book Physics Book Fstring Table Fµ Fn Fg a = 0 (constant velocity to the right)

  10. Equilibrium and Statics When all the forces that act upon an object are balanced, then the object is said to be in a state of equilibrium. The forces are considered to be balanced if the rightward forces are balanced by the leftward forces and the upward forces are balanced by the downward forces.

  11. Determining the Net Force • An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

  12. Spring Forces • Stretched spring Fs< 0 • Equilibrium Fs=0

  13. 4.00 kg

  14. The object hung from the cable has a weight of 25 N. Write the equation for the sum of the forces in the y-direction. What is the tension in the cable? Repeat the problem above with a 5 degree angle. How does the tension compare?

  15. The object hung from the cable has a weight of 25 N. Write the equation for the sum of the forces in the y-direction. What is the tension in the cable? Repeat the problem above with a 5 degree angle. How does the tension compare? 2TSin30 = 25N T=25N

  16. T2Cos30 = 30N T2Sin30 = T1 T2 = 2*T1 T2 = 30N/0.87 T2 = 34.5N T1 = 69N

  17. Use g = 10 m/s/s W=mg = 20 kg * 10 m/s/s = 200N Fn = mgCos30 = 200N*cos30 = 174N How did we do that?

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