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If the forces on an object are balanced, the object will remain at the same speed and in the same direction. If the forces are unbalanced, the object will experience a change in either its speed (acceleration) or direction of motion. The document provides three examples of calculating the resultant force on different objects based on the balanced and unbalanced forces acting upon them.
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- 1. Balanced and unbalanced forces – summary and the object is stationary, it will remain stationary and the object is moving, it will continue to move at the same speed and in a straight line. If the forces are unbalanced, two things can happen: If the forces on an object are balanced: In other words, the object will continue to do what it is already doing without any change. The speed can change. This is called acceleration. The direction of motion can change.
- 2. 20N 1. What is the resultant force on the satellite? Resultant force = 20N – 10N = 10N down The satellite will accelerate downwards. Resultant forces – question 1 5N 5N
- 3. 5N 2. What is the resultant force on the bird? 5N 5N The forces acting in each direction horizontally are equal in size, so there is no resultant force in this direction. Resultant force = 5N – 5N = 0N Resultant forces – question 2 The vertical forces are not balanced, the bird will accelerate in a downwards direction. Resultant force = 5N – 0N = 5N down
- 4. The vertical forces are equal in size and opposite in direction so there is no resultant force in the vertical direction. The horizontal forces are not balanced, so the yacht will accelerate to the right. 10N 13N 3. What is the resultant force on the yacht? 10N 10N Resultant force = (20N +10N) – 13N = 17N right Resultant forces – question 3 20N