An object moves with a uniform velocity when the net force acting on it is___ .
zero
positive
negative
either positive or negative
According to Newton's first law, an object moves with a uniform velocity when the net external force acting on it is zero.
An object moves with a uniform velocity when the net force acting on it is ___.
State whether the work done by an applied force on a body moving on through a horizontal plane with uniform velocity is positive or negative.
When you lift an object, two forces act on it. Identify these forces. Which one of the two does,
(a) positive work
(b) negative work