Yes, it's direction may be constantly changing which would mean it is still accelerating.
When the acceleration is at constant 0, then the velocity will be constant.
An object moving at a constant speed in a straight line has an acceleration of 0. An object at rest also has an acceleration of 0. So, the two things I see in common are their accelerations, which are both 0.
Acceleration is scientifically defined as a change in velocity, not an increase in speed. Thus slowing down, speeding up, or changing direction are all forms of accelerating. If one is moving at a constant speed, then the only way to accelerate would be to change direction.
A straight line with a constant slope
That the object is moving at a constant velocity
If it's moving in a curve or some other non-straight path, then yes. If it's moving in a straight line, then no.
by adding more force
Yes. If an object is moving at a constant speed the average speed and the constant speed are the same.
determine if the momentum of an object moving in a circular path at constant speed is constant.
no
determine if the momentum of an object moving in a circular path at constant speed is constant.
it means the object is moving at a constant speed
Yes. An object moving in a straight line at constant speed has constant velocity.
The object remains in constant, uniform motion. That means its speed and direction of motion don't change. Note that its speed may or may not be zero.
If speed does not change then the object is moving with constant speed. when object moves in a circle its speed does not remains constant. Speed of object remains constant only if it moves along linear path.
When the speed of an object remains the same - it does not increase or decrease - we say it is moving at a constant speed.
equilibrium
Only if the direction is constant and the speed is constant.