第六章测试1.A 2-kg particle moves from velocity
to 
. What is the work done by the net force. （ ）A:16 J B:12 J C:22 J D:36 J
答案:B
2.A 2-kg particle is projected from a table of height 3 m, with a speed 5 m/s. What is the mechanical energy of the particle as it drops down to the height 2 m. （ ）
A:44.6 J B:33.8 J C:64.2 J D:83.8 J 3.In which of the following motions, the work by the net force is zero.（ ）
A:motion with constant acceleration B:motion with constant velocity C:freely falling motion D:uniform circular motion 4.In which of the following situations, the mechanical energy is conserved.（ ）
A:projectile motion B:a block moving on a rough surface C:a block freely falling and compressing a spring D:only conservative forces do the work 5.If non-conservative forces do the work, both mechanical energy and total energy are not conserved. （ ）
A:对 B:错
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