1505745609.pdf - FORCES AND FREEBODY DIAGRAMS Newtons Laws...

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FORCES AND FREE- BODY DIAGRAMS Newton’s Laws Yo!
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Recall: Net Forces Force : any influence that tends to accelerate an object; a push or a pull; measured in NEWTONS (N) Net Force : combination of all the forces acting on an object 5N 5N 5N 5N 5N 10 N Net Force = 10N East Net Force = 0 N Net Force = 5N East **FORCE is a VECTOR QUANTITY
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Support Force/Normal Force -the force pushing back on an object at rest. A book sits on the table: What forces act on it? Force of book on table (due to gravity ) Force of table on book (support force, aka normal force) Bathroom scale: What forces act on it? Force of you on scale (due to gravity) Force of scale on you (support force, aka normal force) Gymnast on Rings Rope undergoes “stretching” force when hanging by it Two vertical ropes share the load (think trapeze, pull ups)
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Recall: Friction Friction results from relative motion between objects. Frictional forces are forces that resist or oppose motion. Depends on…. 2 surfaces in contact (silk, sand paper…) Normal Force (more weight on top of book Friction
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Types of Friction Static friction Sliding (Kinetic) friction Rolling friction
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Free-body diagrams Free-body diagrams are used to show the relative magnitude and direction of all forces acting on an object.
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This diagram shows four forces acting upon an object.
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