![]() In fact, the tendency of moving objects to continue in motion is a common cause of a variety of transportation accidents - of both small and large magnitudes. The law of inertia is most commonly experienced when riding in cars and trucks. It is commonly referred to Newton's first law of motion. Headrests are placed in cars to prevent whiplash injuries during rear-end collisions. While riding a skateboard (or wagon or bicycle), you fly forward off the board when hitting a curb or rock or other object that abruptly halts the motion of the skateboard. To dislodge ketchup from the bottom of a ketchup bottle, it is often turned upside down and thrusted downward at high speeds and then abruptly halted. Perhaps you could speculate what would occur when no seat belt is used. The seat belt provides the unbalanced force that brings you from a state of motion to a state of rest. Yes! Seat belts are used to provide safety for passengers whose motion is governed by Newton's laws. unless acted upon by the unbalanced force of a seat belt. A person in motion stays in motion with the same speed and in the same direction. Thus, you continue in motion, sliding along the seat in forward motion. Have you ever experienced inertia (resisting changes in your state of motion) in an automobile while it is braking to a stop? The force of the road on the locked wheels provides the unbalanced force to change the car's state of motion, yet there is no unbalanced force to change your own state of motion. The presence of an unbalanced force will accelerate an object - changing its speed, its direction, or both its speed and direction. According to Newton, an object will only accelerate if there is a net or unbalanced force acting upon it. Objects at equilibrium (the condition in which all forces balance) will not accelerate. The first law - sometimes referred to as the law of inertia - states that if the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s. Newton's first law of motion predicts the behavior of objects for which all existing forces are balanced. In the absence of an unbalanced force, an object in motion will maintain its state of motion. All objects resist changes in their state of motion. It is the natural tendency of objects to keep on doing what they are doing. 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. All objects resist changes in their state of motion - they tend to "keep on doing what they're doing." The state of motion of an object is maintained as long as the object is not acted upon by an unbalanced force. ![]() If in motion with a leftward velocity of 2 m/s, they will continue in this same state of motion (2 m/s, left). If in motion with an eastward velocity of 5 m/s, they will continue in this same state of motion (5 m/s, East). If at rest, they will continue in this same state of rest. The behavior of all objects can be described by saying that objects tend to "keep on doing what they're doing" (unless acted upon by an unbalanced force). it will slow down if the resultant force is in the opposite direction it will speed up if the resultant force is in the same direction as the object is moving If there is no resultant force then a system is said to be in equilibrium. If the resultant force is zero, a moving object will stay at the same speed. Unless acted upon by an unbalanced force. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction
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