Click here for better understanding on Balanced and Unbalanced Forces.
The seat belt provides the unbalanced force which brings you from a state of motion to a state of rest. Perhaps you could speculate what would occur when no seat belt is used. Click here for better understanding on Newton’s First Law.
If the truck were to abruptly stop and the straps were no longer functioning, then the ladder in motion would continue in motion.
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. Law of Acceleration F net = m . a
It accelerates in the direction that you push it. If you push twice as hard, it accelerates twice as much. If it gets twice the mass, it accelerates half as much. F net = m . a Click here for better understanding on Newton’s Second Law.
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Law of Interaction In every action, there is always an equal and opposite reaction Click here for better understanding on Newton’s Third Law.
The elephant's feet push backward on the ground; the ground pushes forward on its feet. The right end of the right rope pulls leftward on the elephant's body; its body pulls rightward on the right end of the right rope. The left end of the right rope pulls rightward on the man; the man pulls leftward on the left end of the right rope. The right end of the left rope pulls leftward on the man; the man pulls rightward on the right end of the left rope. The tractor pulls leftward on the right end of the left rope; the left end of the left rope pulls rightward on the tractor. etc., etc.
Click for more understanding. up, up and AWAY! Let's study how a rocket works to understand Newton's Third Law.