Inclined Planes, Wedges, & Screws

Inclined Plane An inclined plane or ramp is a tilted surface which allows a resistance to be lifted with less effort.

Inclined Plane As usual, the reduction in effort is accompanied by an increase in __________ .

Inclined Plane As usual, the reduction in effort is accompanied by an increase in distance .

Inclined Plane The AMA of the inclined plane is the resistance divided by the effort. AMA = resistance effort

Inclined Plane The IMA of the inclined plane is the incline length divided by the height. IMA = incline length height

Inclined Plane IMA = incline length height incline length height

Types of Inclined planes

Wedge A wedge is normally shaped like two inclined planes back to back. It is used to split an object as it is forced into the object.

Wedge The IMA of a wedge is calculated the same as the IMA of the inclined plane. IMA = incline length width

Wedge How would one increase the IMA of a wedge? incline length IMA = width

Wedge The more narrow the wedge, the greater the IMA. How would one increase the IMA of a wedge? The more narrow the wedge, the greater the IMA. IMA = incline length width

Screw A screw is an inclined plane wrapped around a central shaft in a spiral shape.

The ridges on a screw’s shaft are called threads. The distance between threads is called the pitch.

How would one increase the IMA of a screw?

The lower the pitch, the higher the MA. Screw How would one increase the IMA of a screw? The lower the pitch, the higher the MA.

Screw Low Pitch High Pitch

What is the MA of this ramp? 0.375 1.5 2.5 2.67 4 m 1.5 m