1/ You are pulling a suitcase through the airport at a constant speed. The handle of the
suitcase makes an angle of 60° with respect to the horizontal direction. If you pull with a
force of 5.0 N parallel to the handle, what is the contact force due to the floor acting on
the suitcase?
2/ While an elevator of mass 2530 kg moves upward, the force exerted by the cable is
33.6 kN. (a) What is the acceleration of the elevator? (b) If at some point in the motion
the velocity of the elevator is 1.20 m/s
upward, what is the elevator’s velocity 4.00 s
later?
3/ Alex is on stage playing his bass guitar. Estimate the magnitude of the
gravitational
attraction between Alex and Pat, a fan who is standing 8 m from Alex. Alex has a mass of
55 kg and Pat has a mass of 40 kg.
4/ Find and compare the weight of a 65kg man on Earth with the weight of the same
man on (a) Mars, where
g
= 3.7 N/kg; (b) Venus, where
g
= 8.9 N/kg; and (c) Earth’s
Moon, where
g
= 1.6 N/kg.
5/ During a balloon ascension, wearing an oxygen mask, you measure the weight of a
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 Spring '09
 HUANG
 Force, Friction, Mass, Alex

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