1) A sky diver with an open parachute approches theground with constant velocity. There is no wind to blow him fromside to side. Which statement is correct?
a) The skydiver is not in equallibrium.
b) The force gravity is the only force acting on him, so thathe is in equalibrium.
c) He wants to be in equalibrium but cant figure outhow.
d) He is in equalibrium because no forces are acting onhim.
e) He is in equalibrum because two forces act on him, thedownward force of gravity and the upward force of theparachute.
2) An object is moving at a constant velocity. Whichstatement has to be false?
a) No forces act on the object.
b) A single force acts on the object.
c) Two forces acts simultaneously on the object.
d) Three forces act simultaneously on the object.
e) many forces act on him simultaneously.
3) Two boxes accelerate at the same rate when a force F isapplied to the first box and a force 3F is applied to the secondbox. If the first box has a mass M, the second box has amass
a) 3M
b) 9M
c) M
d) M/3
e) M/9