Select T-True, F-False, for each statement. If the first is T and the rest F, en
ID: 1784668 • Letter: S
Question
Select T-True, F-False, for each statement. If the first is T and the rest F, enter TFFFFF.
A) The work done to raise a box onto a platform depends on how much time it takes to raise it. (Neglect friction, assume it starts on the ground at rest, and ends up resting on the platform)
B) The work done by a constant force acting on an object is independent of the orientation of the force relative to the motion of the object
C) Work cannot be done in the absence of motion.
D) The kinetic energy of an object is independent of the direction of the motion involved.
E) The kinetic energy of a moving object is always positive.
F) The work-energy principle is not valid if there are frictional forces acting.
Explanation / Answer
FFTTTF
a) It is independent of time. "F"
b) It depends on the orientation of the force relative to the motion of the object. "F"
c) If displacement is zero, so work done will be zero. "T"
d) KE depend on the magnitude of the velocity. "T"
e) KE is either zero or positive. It can't be negative. "T"
f) Work Energy principle works everywhere. "F"