Terms
A series of things interacting for a common function is known as what?
System
What were early machines designed to help humans with?
Securing their basic needs
What type of simple machine would a ramp be classified as?
Incline plane
What type of lever is a see saw?
Class 1
0J work
Define contact and non-contact forces
Contact - a push or a pull that results from the direct touching of particles
non-contact - a push or a pull that does not require the direct touching of particles
What early machine was used to help transfer water many kilometers?
Roman aqueduct
What simple machine is made by placing two incline planes together?
Wedge
What type of lever are tweezers?
class 2
What is the MA if the input force is 5N and the Output force is 10N?
MA = 2
Define work
the physics term for the energy needed to displace an object.
Work = force/distance
What were the primary energy sources for the early machines
Animals and humans
What type of simple machine is a ceiling fan
A wheel and axle
Where is the fulcrum located on a class 1 lever?
in the middle
What is the speed ratio for an Input distance of 50m and an output distance of 25m
SR = input/output
SR = 50m/25m
Speed ratio = 2
What is the term for the following: The change in position of an object
Displacement
An Archimedes screw is built by putting a ___i____ inside of an ___ii_____.
i= screw
ii=pipe/cylinder
What simple machine is used as a fastener and converts rotation to linear force?
screw
What is the order of Fulcrum, Effort, and Load for a class 2 lever
Load
------------------------------------------
Effort Fulcrum
What is the efficiency of a system that has a MA of 0.9 and a speed ratio of 3?
09./3 = 0.3
0.3 x 100 = 30%
Define efficiency
The amount of energy or force needed to do work. The more efficient a machine, the less force is needed.
What is another word for the persian wheel?
Sakai
What simple machine is useful in increasing the speed of an object?
Lever (class 3)
Daily double
Draw and label the fulcrum, load, and effort for all 3 classes of levers
Daily double
What is the output force if you have a MA of 0.45 and an input force of 8?