Originally Posted by

**s3a** __Question:__

*Select T-True, F-False, for each statement. If the first three statements are T and the rest F, enter TTTFFFFF. *

*A) The friction force is a conservative force.*

*B) Work cannot be done in the absence of motion.*

*C) Spring A is stiffer than B (kA > kB). Less work must be expended on spring A if both springs are stretched by the same amount.*

*D) The kinetic energy can never be negative.*

*E) If the moon revolves around the earth in a perfectly circular orbit, then the earth does not do any work on the moon.*

*F) The kinetic energy of an object depends on the direction of the motion involved.*

*G) The kinetic energy depends on the reference frame of the observer.*

*H) The work done to raise a box onto a platform does not depend on how fast it is raised.*

My computer system does not tell me if an individual one is right or wrong unless I get them all right simulatenously so I'd appreciate it if someone could tell me which one is true and which one is false so that I could isolate my mistake and see what I did wrong.

Any input would be greatly appreciated!

Thanks in advance!