Real World Simple Machines

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Real World Simple Machines - PowerPoint PPT Presentation

Real World Simple Machines. By Professor D.M. Isaacson I. Lever. rigid object and a fulcrum (or pivot) Applying a force to one end of the rigid object causes it to pivot about the fulcrum. Magnifies of the force at another point along the rigid object. .

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Real World Simple Machines

By

Professor D.M. Isaacson I

Lever
• rigid object and a fulcrum (or pivot)
• Applying a force to one end of the rigid object causes it to pivot about the fulcrum.
• Magnifies of the force at another point along the rigid object.

Here the crane operator uses the levers of the machine to operate the much larger arm,

Wheel & Axle
• circular device that is attached to a rigid bar in its center.
• force applied to the wheel causes the axle to rotate, which can be used to magnify the force
• For example, having a rope wind around the axle.
• force applied to provide rotation on the axle translates into rotation of the wheel
• A lever that rotates around a center fulcrum…

In the coreless impact drill, a ‘large’ gear is driven which rotates the axle-in this case, the chuck

Inclined Plane
• a plane surface set at an angle to another surface.
• do the same amount of work by applying the force over a longer distance.

Because the ladder is a shorter distance, it is more difficult to climb, compare to a stairway with a much longer distance, much easier to climb.

Wedge
• a double-inclined plane that moves to exert a force along the lengths of the sides.
• The force is perpendicular to the inclined surfaces, so it pushes two objects (or pieces of a single object) apart.

The splitting maul uses the basic concept of the wedge to split firewood much more easily than with a smaller axe.

Screw
• a shaft that has a in inclined groove along its surface.
• rotate the screw
• the force is applied perpendicular to the groove, thus translating a rotational force into a linear one.

The blades of the ice auger cut, as the auger portion draws the whole tool down into the ice.

Pulley
• a wheel with a groove along its edge, where a rope or cable can be placed.
• applies force over a longer distance, and also the tension in the rope or cable, to reduce the magnitude of the necessary force.

The old-fashioned version of the wire stretcher utilized twp pulleys and a length of rope to greatly reduce the work involved with tightening a wire fence.