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February 23, 2025
• Do Now: Read through the Lever Lab directions and answer the first three questions
• Find the weight in Newtons of the gravel container by using the spring scale (that is your resistance)
• Homework: Study for test and finish contract project
Terminology
Where your hands are• Effort• Input• Output DISTANCE
Where the load is• Load• Output• Resistance• Input DISTANCE
Mechanical Advantage
Effort Force = Output Distance = Resistance Distance = Input Force
Resistance Force = Input Distance = Effort Distance = Output Force
Inclined Plane
• Reduces force, but increases distance• The mechanical advantage of an inclined plane
is length divided by height. • Wedges and screws are types of inclined
planes.
Wedge
• A wedge generates outward forces• A wedge is a type of inclined plane. Its
mechanical advantage is its length divided by its greatest thickness.
Screw
• A screw is an inclined plane wrapped around a cylinder
• Uses a small force over a longer distance
• The closer the threads, the lower the force required
Levers – Three Classes
• Can change direction & size of force• In a first-class lever, the fulcrum is between
the force and the load.• In a second-class lever, the load is between
the force and the fulcrum. • In a third-class lever, the force is between the
fulcrum and the load.
Pulleys
• Change direction and may change input force• Types of pulleys include fixed pulleys, movable
pulleys, and block and tackles.
Wheel and Axle
• The mechanical advantage of a wheel and axle is the radius of the wheel divided by the radius of the axle.
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