Using the term "trajectory" implies that the acceleration you are concerned about is due to gravity. Gravity will always be perpendicular to the surface. Unless the trajectory begins perpendicular to the surface, it will never change to become perpendicular and the velocity will never be in a direction parallel to the acceleration. If it starts perpendicular to the surface it will start and remain perpendicular.
Of course if you have another force acting on the object - such as wind - the component of the velocity vector parallel to the ground could be reduced to zero and at that point the only remaining component of the velocity vector would be that perpendicular to the ground and parallel to the acceleration.
Likewise if the object is being propelled by an engine or rocket, the trajectory could be parallel to the force any time the acceleration vector became parallel to the velocity vector.
Yes, although there are two acceleartion vectors - one due to air resistance, one due to gravity. Gravity and velocity are perpendicular at the top point of the arc of travel.
If the shot or the toss is straight up, then they're parallel everywhere.
If the shot or the toss is NOT straight up, then they're never parallel.
no
Both are vectors. But acceleration and velocity have different dimensions. Acceleration is defined as the rate of change of velocity.
Any falling object has acceleration and velocity vectors in the same direction.
Acceleration in physics is the change in velocity in change in time. Resulting acceleration comes from applying force to a body. The equation is velocity final minus velocity initial divided by change in time.
-- The magnitude of acceleration is equal to the time rate of change of speed. -- The magnitude of acceleration is equal to the time rate of change of the magnitude of velocity. -- Acceleration and velocity are both vectors.
no
Both are vectors. But acceleration and velocity have different dimensions. Acceleration is defined as the rate of change of velocity.
Any falling object has acceleration and velocity vectors in the same direction.
Acceleration in physics is the change in velocity in change in time. Resulting acceleration comes from applying force to a body. The equation is velocity final minus velocity initial divided by change in time.
-- The magnitude of acceleration is equal to the time rate of change of speed. -- The magnitude of acceleration is equal to the time rate of change of the magnitude of velocity. -- Acceleration and velocity are both vectors.
Position is a vector. Therefore, its first derivative with respect to time (velocity), and its second derivative with respect to time (acceleration) are also vectors.
I only know three: Velocity,Acceleration, and Force
Force, velocity, acceleration, and displacement are vectors. Mass, temperature, time, cost, and speed are scalars (not vectors).
Both velocity and acceleration of vectors because their magnitude is dependent on their direction. For example a velocity of 6 ft/s is different from a velocity of -6ft/s because they are in opposite directions. Like wise, an acceleration of 9.8 ft/s^2 indicates an increase in velocity while -9.8 ft/s^2 indicates a decrease in velocity.
Typical uses of vectors include force, position, velocity, acceleration, torque, rotational movement, and others.
The moving object is slowing down.
Vectors can represent anything that has both magnitude and direction, like velocity, acceleration, momentum, force, etc.