27404 Parallax Inc, 27404 Datasheet - Page 27

• Manufacturer Part Number: 27404
• Description: COMPETITION RING FOR SUMOBOT
• Manufacturer: Parallax Inc

Specifications of 27404

• Accessory Type: Hobby and Education
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: SumoBot®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Scales that show both ounces and grams are not uncommon, likewise with scales that
show both kilograms and pounds. They all appear to work because they are being used
on the Earth's surface. When astronauts took equipment from the earth to the moon, the
equipment weighed less because gravity on the moon isn't as strong. However, each
piece of equipment still had the same mass (total protons neutrons and electrons). Since
scales that measure mass are actually measuring mass based on earth-weight and calling
it mass, those scales would incorrectly tell you the object had less mass on the moon.
Understanding the difference between weight (force) and mass isn't just required for
space travel. There are lots of equations that involve force, mass, and acceleration that go
into the design of all things mechanical. The designs of bridges, generators, airplanes,
cars, and missiles all depend on the correct use of force and mass in a variety of
equations. If an engineer tries to use a force value where a mass value was actually
required, his/her design won't work right. Table 1-1 shows a list of forces, masses, and
accelerations in three different systems - SI, cgs, and British Engineering.
The force exerted on an object is equal to its mass multiplied by the rate at which it
accelerates. That's (F)orce = (m)ass × (a)cceleration:
System International (SI)
F
British Engineering
=
System of Units
m
×
a
Newton's second law of motion states that the acceleration of an object is directly
proportional the applied force and inversely proportional to its mass.
To get from this to F=m×a, put the terms on opposite sides of the = sign, then multiply both
sides by m.
cgs
a =
m
F
Table 1-1: Units of Force, Mass, and Acceleration
Newton
Force
pound
dyne
(lb)
(N)
kilogram
Mass
gram
slug
(kg)
(g)
Chapter 1: Mechanical Adjustments · Page 23
centimeter per second squared
meter per second squared
foot per second squared
Acceleration
(cm/s
(m/s
(ft/s
2
2)
2
)
)