The blank of a body at rest should be known to determine how...

The Blank______ of a body at rest should be known to determine how much force will be exerted at a point on its design, and the concepts of Blank______ enable one to calculate how much force is needed to send a satellite into orbit, accelerate a 200,000-ton cruise ship, or design a toy truck that does not break.

Newton's first law of motion states than an object's motion will not change unless the net force acting on it is greater than zero. Force continues to be applied to the object if its inertia is stronger than the applied force. The object has inertia. Overcoming an object's inertia always requires a massive force or an unbalanced force. It is more difficult to start a 50-kg box sliding across the floor than a 5-kg box because the 50-kg box has greater inertia. Once an object starts moving along a clear path, it would keep moving at the same velocity if it were not for inertia and friction, or an unbalanced force. An object's velocity will not change unless it is acted on by a net force or an unbalanced force. The direction of a moving object will not change if the net force acting on it is greater than zero.

Ryan M.

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