MORE ABOUT FORCES.

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Presentation transcript:

MORE ABOUT FORCES

Net force & Free Body Diagrams Net force = vector sum of the forces acting on an object Free Body Diagram (FBD) depicts the forces Arrows point in direction of forces Relative lengths of arrows show relative magnitudes of forces

NET FORCE Net = total Net force is the vector sum of all the forces acting on an object. Direction of the force matters! (Pay careful attention to + and – signs)

An example Consider the rabbit 2 forces act on it: Fnet=Fhand+W Its weight pulls it downward The magician’s hand holds it up Fhand Fnet=Fhand+W W

An example continued Fnet=Fhand+W Fnet= +30-19.6 Fnet = +10.4 N Suppose the rabbit has a mass of 2 kg What is its weight? What sign can be used to indicate the direction that the weight acts? Suppose the magician pull the rabbit out of the hat with a force of 30N What is the net force on the rabbit? Fhand=+30N Fnet=Fhand+W Fnet= +30-19.6 Fnet = +10.4 N W=mg W= -19.6N

Equilibrium If the forces are balanced, the net force is on an object is zero. We say that an object is in equilibrium. How would you expect an object that’s in equilibrium to ‘react’ to the forces acting on it? How would you expect an object that’s not in equilibrium to ‘react’ to the forces acting on it?