According to Newton's first law, an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. It is the natural tendency of objects to keep on doing what they are doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion. This is often called the law of inertia.
MotorcycleWhat would happen if the rider were not wearing the seat belt?
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Truck & ladderWhat would happen if the ladder was negligently strapped to the truck in such a way that it was free to slide along the top of the truck?
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