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. Momentum, on the other hand, explains some of the most important interactions in nature. The submarine will continue with the same motion, either remaining stationary or moving at a constant speed. Newtons laws of motion help explain why an object needs a force to make it move - inertia also explains this. This means that there is no resultant vertical acceleration. They are balanced, so the vertical resultant force is also zero. The above statement means that in every interaction, there is a pair of forces acting on the interacting objects. The vertical forces are equal in size and opposite in direction. Newton’s third law of motion states that When one body exerts a force on the other body, the first body experiences a force which is equal in magnitude in the opposite direction of the force which is exerted. 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. Permitted use Stream, Download and Share. The horizontal forces will not affect its vertical movement and the vertical forces will not affect its horizontal movement. However, as Newton's third law of motion suggests, working in space can be physically demanding. 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.
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