Using vector to work out the component of the acceleration acting parallel to a bannister
The bannister's is inclined at 30 degree. Determine the exit velocity from a 10 m long bannister which is frictionless.
Why does a force not do any work if it's perpendicular to the motion?
I have a book that says the Moon's orbit is [in this context assumed to be] circular. The Earth does no work on the moon. The gravitational force is perpendicular to the motion. Why is there no... more