27403 Parallax Inc, 27403 Datasheet - Page 38

• Manufacturer Part Number: 27403
• Description: GUIDE APP ROBOTCS W/SUMOBOT V1.0
• Manufacturer: Parallax Inc

Specifications of 27403

• Accessory Type: Manual
• 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

Problem: The coefficient of static friction for two surfaces is 0.1 (pretty slippery). How
much force will it take to get a 10 lb weight to start to slide if the contact surfaces are
level?
Solution: It takes 1 lb of force to start the object's slide:
Problem: If you increase the weight from the previous problem to 20 lb, how much force
will you need to overcome static friction?
Solution: Twice the weight means you need to apply twice the force.
Parts and Equipment
A pulley and weight system will be used to test the SumoBot tread's coefficient of
friction and response to increased weight. Unless noted, these parts are not included in
the SumoBot Robot Competition Kit
(1)
(1)
(1)
(1)
(1)
(1)
(misc) Assorted weights (nails, nuts, bolts, pennies, fishing sinkers, etc).
f
f
S
S
=
=
=
=
=
=
1
µ
µ
0
0
2
Pulley and attachment hardware
SumoBot (included)
Sumo ring (included)
String or fishing line strong enough to suspend both your SumoBots. Length
should be approximately 1 m.
Scale able to measure grams or ounces
Disposable plastic cup
1 .
1 .
S
S
lb
lb
×
×
×
×
This is the reason adding weight to your SumoBot will increase the friction force the sumo
ring exerts on it.
W
W
10
20
lb
lb