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Force and Acceleration (Resultant force (The resultant force is the sum of…
Force and Acceleration
A force may cause a mass to accelerate. This acceleration can be a change in speed, a change in direction or a change in both speed and direction.
Resultant force
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If the forces acting on an object are unbalanced (not equal) it means that a resultant force is acting on the object.
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Newton’s 1st Law
Newton's 1st Law says that the velocity of an object will only change if a resultant force is acting on the object. This applies to a still or moving object.
Stationary: If an object is stationary (not moving) and there is no resultant force acting on it, it will stay stationary.
Moving: If an object is moving and there is no resultant force acting on it, the object will continue moving in the same direction at the same speed.
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Newton 1st Law - Example
When a vehicle is travelling at a steady speed, the resistive forces (such as friction and air resistance) are balancing the driving force.
When there are balanced forces, there is no resultant force.
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