1. Inclined Planes, Wedges, & Screws

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

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

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

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

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

7. Inclined Plane
IMA =
incline length
height
incline length
height

8. Types of Inclined planes

9. 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.

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

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

12. 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

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

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

15. How would one increase the IMA of a screw?

16. 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.

17. Screw
Low Pitch
High Pitch

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