PLTW Test Corrections

graphical model

develop solution

design brief

define the problem

test report & working model

construct and test prototype

project portfolio

present solution

project recommendations

evaluate solution

decision matrix

generate concept

criterion

things the design needs to do in order to be successful--its requirements

constraint

limitations on the design, such as available funds, resources, or time

IQR

Q3-Q1

how to find Q1 and Q3

first arrange your data in ascending order, then find the median (Q2), which divides the data into two halves. Q1 is the median of the lower half, and Q3 is the median of the upper half

The greatest possible error on a dial caliper

± 0.005in

the greatest possible error is always the

smallest unit of measurement divided by two

what do section lines look like?

thin parallel lines

Ball Joint

allows for two degrees of rotational freedom- pitch (z-axis) and yaw (x-axis)

Planar Joint

allows for two directions of translation within a plane and a single rotational direction normal (perpendicular) to that plane (such as xy translation and rotation around the z-axis); three degrees of freedom

Pin Slot Joint

translation on one axis and rotation around one axis (two degrees of freedom; the axes can be different)

Cylindrical Joint

translation and rotation about the same axis (two degrees of freedom)

slider joint

single translational degree of freedom; you can choose which axis to translate upon

revolute joint

single rotational degree of freedom (like a hinge); you can choose which axis to rotate about

rigid joint

locks all degrees of freedom and keeps two components fixed to one another