Datasheet

Page 34· Applied Robotics with the SumoBot
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:
lb1
lb101.0
Wf
SS
=
×=
×=
µ
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.
lb2
lb201.0
Wf
SS
=
×=
×=
µ
This is the reason adding weight to your SumoBot will increase the friction force the sumo
ring exerts on it.
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) SumoBot (included)
(1) Sumo ring (included)
(1) String or fishing line strong enough to suspend both your SumoBots. Length
should be approximately 1 m.
(1) Scale able to measure grams or ounces
(1) Pulley and attachment hardware
(1) Disposable plastic cup
(misc) Assorted weights (nails, nuts, bolts, pennies, fishing sinkers, etc).