![]() 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. Newtons 3rd Law: If object A exerts a force on object B, then object B exerts an equal and opposite force of the same type on object A (this is better than. They practice identifying action-reaction force pairs for a variety of real-world examples, and draw and explain simplified free-body diagram vectors (arrows) of force, velocity and acceleration for them. They are balanced, so the horizontal resultant force is zero. Students are introduced to Newton's third law of motion: For every action, there is an equal and opposite reaction. Newtons third law of motion: For every action, there is an equal and opposite reaction. From this law, we derive the following equation: Force mass × acceleration (Fma). ![]() The horizontal forces are equal in size and opposite in direction. Newtons second law of motion: The acceleration of an object depends on the mass of the object and the amount of force applied. 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
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