In Fig. 2 below, a ball is placed on a flat part of the floor of a pickup truck. In accordance with Newton's First Law of Motion, what will happen to the ball when the vehicle: moves forward from a stopped position? (ii) is moving at constant speed? (iii) is moving at constant speed, then turns to the right? (iv) is moving at constant speed, then comes to a sudden stop?

c) In accordance with Newton's First Law of Motion, what will happen to the ball when the vehicle:

i) moves forward from a stopped position?
The ball will roll or slide backward relative to the truck. Due to inertia, the ball tends to remain at rest while the truck moves forward beneath it.

ii) is moving at constant speed?
The ball will remain in its position relative to the truck, moving along with the truck at a constant speed. Due to inertia, it maintains its state of motion.

iii) is moving at constant speed, then turns to the right?
The ball will roll or slide to the left relative to the truck. Due to inertia, the ball tends to continue moving in a straight line while the truck turns right.

iv) is moving at constant speed, then comes to a sudden stop?
The ball will roll or slide forward relative to the truck. Due to inertia, the ball tends to continue moving forward at its original speed while the truck stops.