Final answer:
Loose objects on a dashboard seem to slide to the right when a car turns left because of inertia and the centrifugal force, which is particularly noticeable in sharper turns or at higher speeds.
Step-by-step explanation:
Loose objects on the dashboard slide to the right when the car turns suddenly to the left due to a phenomenon called centrifugal force. When the car turns left, everything inside the car, including objects on the dashboard, initially continue their motion in a straight line due to inertia, as stated by Newton's first law of motion. This results in objects appearing to slide to the right, despite there not being a real force pushing them that way; this effect is more pronounced the sharper the turn or the greater the speed of the car.