D. Inclined Plane Inclined Plane sloping surface used to raise objects

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Presentation transcript:

D. Inclined Plane Inclined Plane sloping surface used to raise objects h l

E. Screw Screw inclined plane wrapped in a spiral around a cylinder

F. Wedge Wedge a moving inclined plane with 1 or 2 sloping sides

F. Wedge Zipper 2 lower wedges push teeth together 1 upper wedge pushes teeth apart

Problems h Fe l MA Fr Fe = ? IMA = l ÷ h IMA = (3 m)÷(1.2 m) How much force must be exerted to push a 450 N box up a ramp that is 3 m long and 1.2 m high? IMA l h MA Fr Fe GIVEN: Fe = ? Fr = 450 N l = 3 m h = 1.2 m WORK: IMA = l ÷ h IMA = (3 m)÷(1.2 m) IMA = 2.5 Fe = Fr ÷ MA Fe = (450 N)÷(2.5) Fe = 180 N

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