No. It is affected by localised pressure differences, thermals - which depend on the the heat-retention property of the surface, surface contours (including man-made ones).
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no a snake cannot move in a straight line as its bones are not stretchable_^^^^^^^^^^&
A projectile (shot from a cannon, for instance) will fly in a curved line and land on the ground, due to the attraction of the Earth's gravity. Snipers have to allow for this curvature effect, and also the side pressure from any wind.
2 points. However, the farther apart the 2 points the striaghter the line will be, unless you move the straight edge!!.
A particle moving in a straight line may or may not have acceleration. Acceleration is adifferent phenomenon altogether. the rate of change of velocity is acceleration, a particle can move in a straight line with a constant velocity thus having no acceleration & it can also move with increasing or decreasing velocities thereby accelerating or deaccelerating.
inertia......