1. D. Inclined Plane Inclined Plane sloping surface used to raise objectsh l

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

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

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

5. 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