27404 Parallax Inc, 27404 Datasheet - Page 32

• 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

N = W indicates that the normal force, N, is pushing back just as hard as the object's
weight is pushing down on the surface. This has to be true. If it wasn't, the block would
sink through the table, or maybe the table would start sinking into the earth.
Coefficients of Friction
Different pairs of surfaces tend to exert different kinetic and maximum static frictional
forces. For example, if you try to slip your shoe along concrete on a sidewalk, it'll
probably resist pretty strongly. However, if there's ice on the sidewalk, your shoe will
slip right along it with barely any frictional force.
Since each pair of materials resists the applied force with different levels of f
term called the coefficient of friction is used to predict how much force it will take to
make one material slide along another. In the case of static friction, this coefficient, µ
the maximum force you can apply before the object starts sliding divided by the normal
force. In the case of kinetic friction, µ
divided by the normal force.
∑
N
N
µ
S
−
=
Fy
=
W
W
f
=
, S
=
N
Max
0
Newton's Third Law can be summarized like this: if two bodies (such as the block and the
surface it's on) interact, each body exerts an equal and opposite force on the other.
The drawings of the forces acting on the block and setting the sum of all the forces equal to
zero is dictated by this law.
The Greek letter mu - µ - is commonly used for to denote coefficients of friction. µ is also a
coefficient for units such as seconds, amps, and meters (µs, µA, µm). In those cases, µ is a
different coefficient, with a value of one-one-millionth (
coefficient of static friction, µ
to microseconds, it's just µs, with a lower-case 's'.
0
and
µ
K
=
f
N
K
S
, always remember to subscript the capital S. When referring
k
is the force required to keep the object sliding,
1
/
1,000,000
). If you are referring to the
S
and f
K
s
, a
is