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I am missing… . 2 1 classroom textbook (1 was returned) 2 bottles of white out 1 calculator Until these items are returned, borrowing privileges are suspended… bring your own textbooks and your own calculators . . In Summary… .
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I am missing… • 21 classroom textbook (1 was returned) • 2 bottles of white out • 1 calculator Until these items are returned, borrowing privileges are suspended… bring your own textbooks and your own calculators.
In Summary… • Newton’s 1st Law states that UNLESS there is a net force, • an object at rest will stay at rest • An object in motion will stay in motion without acceleration • In other words, it will not accelerate it will not change its velocity it will not speed up, slow down, or change direction. • Does the marble travel in a straight line? • So…does it change direction? • So… does it accelerate? No Yes Yes
In Summary… • Newton’s 2nd Law states that IF there is a net force, • an object will accelerate • In other words it will change its velocity it will speed up, slow down, change direction or any combination of the 3. • Does the marble travel in a straight line? • So…does it change direction? • So… does it accelerate? • So… is there a force that causes this acceleration? Your goal is to figure out what direction this force acts (and therefore, what direction the acceleration acts, since the acceleration is in the same direction as the net force) No Yes Yes Yes
Centripetal Force • Any force that causes an object to follow a circular path. • Centripetal means “center seeking” or “toward the center.” • The force that holds the occupants in a rotating ride.
Centrifugal Force • The Physics curse word!!! • The forbidden F word – fake, false, fictitious, • Very commonly misused. • Means “center-fleeing” or “away from the center.” • It is NOT real force because it is NOT part of an action-reaction pair! • Misconception that centrifugal force pulls you outward during circular motion. THERE IS NO FORCE PULLING YOU OUTWARD! • Actually, it is just the inertia of the body traveling tangent to the circle.
As a ball is whirled above the head, it is the inertia of the ball that wants to continue moving in a straight line. Instead, the ball is forced inward to change its direction (Centripetal Force-supplied by string).
