If the submarine is moving, it is impossible to tell which direction it is moving from the forces alone, only that it will continue in the same direction at the same speed. The submarine will continue with the same motion, either remaining stationary or moving at a constant speed. This means that there is no resultant vertical acceleration. They are balanced, so the vertical resultant force is also zero. The vertical forces are equal in size and opposite in direction. This means that there is no horizontal acceleration. They are balanced, so the horizontal resultant force is zero. The horizontal forces are equal in size and opposite in direction. The horizontal forces will not affect its vertical movement and the vertical forces will not affect its horizontal movement. The submarine above has both vertical forces and horizontal forces acting on it. If the forces acting on an object are not balanced, the resultant force is not zero Forces on a submarine an object that begins to fall experiences less air resistance than its weight, so it accelerates.at the start of their run, a runner experiences less air resistance than their thrust, so they accelerate.For example, when a car accelerates, the driving force from the engine is greater than the resistive forces. This includes situations when the speed changes, the direction changes, or both change. Newton's first law can also be used to explain the movement of objects travelling with non-uniform motion. If the forces acting on an object are balanced, the resultant force is zero Examples of objects with non-uniform motion This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another. Newtons third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. an object falling at terminal velocity experiences the same air resistance as its weight This remarkable fact is a consequence of Newtons third law.a runner at their top speed experiences the same air resistance as their thrust.For example, when a car travels at a constant velocity, the driving force from the engine is balanced by the resistive forces such as air resistance and frictional forces in the car's moving parts. Newton's first law can be used to explain the movement of objects travelling with uniform motion (constant velocity). a moving object continues to move at the same velocity (at the same speed and in the same direction).If the resultant force on an object is zero, this means: According to Newton's first law of motion, an object remains in the same state of motion unless a resultant force acts on it.
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