When an object undergoes acceleration
its speed always increases
a force always acts on it
the force may be zero
When a body undergoes acceleration there is always a force acting on it.
Which of the following statement must always be true?
I.If an objects acceleration is zero, then its speed must remain constant.
II. If an objects acceleration is constant, then it must move in a straight line.
III. If an objects speed remains constant, then its acceleration must be zero.
No work is done by a force on an object if
a) force is always perpendicular to its velocity
b) the object is stationary but the point of application of force moves on the object
c) the object moves in such a way that the point of application Of the force also moves
d) the force is always perpendicular to its acceleration.