Wing "flaps" that raise on landing

From: (Ping Huang)
Organization: Massachusetts Institute of Technology
Date:         30 Jan 93 22:42:50 PST
Followups:    1 2 3
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When a jetliner lands, usually flaps on the wings are raised. Is the
primary braking effect from the additional air resistance, or from the
fact that the airplane is also pushed downward and therefore the brakes
on the landing wheels exert more friction against the runway?

Ping Huang (INTERNET:, probably speaking for himself