Yes, just as the acceleration is reversing your direction of movement.
Yes, but only at one instant. For instance, if you throw an object straight up, when it reaches the highest point its instantaneous speed is zero, but of course its speed is changing - thus, acceleration is non-zero.
Not with any sensible definition of "acceleration" and "velocity." You CAN accelerate an object and have it end up at zero velocity. But, if the acceleration remains a non-zero number, then the velocity can NOT remain at zero. Your question is like asking, "Can the value of a quantity change, but also remain the same?"
Yes. Eg : in case of a uniform circular motion. In general, for every motion in which direction of motion of particle keeps changing continuously and the particle moves with same speed, then the net acceleration is non-zero, although tangential acceleration is zero.
No. If the sum of all the forces on the object is not zero, then the object's acceleration is not zero, meaning that either its speed or direction of motion, or both, are changing.
For uniform motion, the acceleration is zero. For non-uniform motion, the acceleration is something different than zero - at least, most of the time.
Yes. You could be moving left with an acceleration to the right (decelerating) and come to a stop before you begin to move to the right.
Yes, but only at one instant. For instance, if you throw an object straight up, when it reaches the highest point its instantaneous speed is zero, but of course its speed is changing - thus, acceleration is non-zero.
If an object is sustaining a constant velocity it has 0 acceleration, because acceleration is either increasing or decreasing speed.
Not with any sensible definition of "acceleration" and "velocity." You CAN accelerate an object and have it end up at zero velocity. But, if the acceleration remains a non-zero number, then the velocity can NOT remain at zero. Your question is like asking, "Can the value of a quantity change, but also remain the same?"
When the object's speed changes, in either direction, there is non-zero acceleration present, and the sum of all the forces on the object is also non-zero.
in circular motion
Yes. Eg : in case of a uniform circular motion. In general, for every motion in which direction of motion of particle keeps changing continuously and the particle moves with same speed, then the net acceleration is non-zero, although tangential acceleration is zero.
No. If the sum of all the forces on the object is not zero, then the object's acceleration is not zero, meaning that either its speed or direction of motion, or both, are changing.
For uniform motion, the acceleration is zero. For non-uniform motion, the acceleration is something different than zero - at least, most of the time.
For uniform motion, the acceleration is zero. For non-uniform motion, the acceleration is something different than zero - at least, most of the time.
Yes. Consider a skydiver in freefall. Fairly quickly the skydiver will reach terminal velocity (the speed at which their acceleration from gravity is cancelled out by the resistance of the air through which they are falling). At terminal velocity the skydiver has non-zero velocity (about 56m/s or 200km/h) but zero acceleration (because their velocity is not increasing). In a vacuum, where there is no air resistance, there is also no terminal velocity. Because there is no force acting against acceleration an object will continue to accelerate provided its source of acceleration continues to be applied. It is worth noting that an object cannot use this rule to exceed the speed of light because as the speed of light is approached the relative time for the object slows. On earth, however, or indeed in any similar environment, an object can certainly have zero acceleration and non-zero velocity.
Yes. Velocity is speed per unit of time with a direction vector telling you which way the object in question is moving. Acceleration is a change in velocity - in any part of velocity. If something like, say, a rock is in deep space (a zillion light years from anything) and it's moving along unaffected by any gravity or other forces, it has some velocity (some speed in a given direction, or is moving at some distance per unit of time in a given direction), but it isn't changing speed or direction. If something is moving without changing its speed or its direction (either of which requires a force to act on the object - to accelerate the object), it has zero acceleration. Such an object is said to have a constant velocity and will have zero acceleration. Certainly if an object is not moving, it has zero velocity and zero acceleration, but that's probably not what is being asked. It has velocity (zero) and no acceleration. To recap, an object can have a non-zero velocity and zero acceleration.