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Resultant force or unbalanced force how does a resultant force increase the velocity? Direction of resultant force is same direction as motion, Resultant force or unbalanced force how does a resultant force decrease the velocity? Direction of resultant force is opposite to motion, Forces & Motion what does change in motion mean? A change in motion can mean - velocity increases - velocity decreases - direction of velocity changes, Forces & Motion what causes a change in motion? Resultant force or unbalanced force, Direction of resultant force is same direction as motion how does resultant force relate to acceleration? Resultant force, F Acceleration, a = --------------------- mass, m v = u + a t where v = Final velocity u = Initial velocity t = time, Direction of resultant force is opposite to motion how does resultant force relate to deceleration? Resultant force, F Deceleration, a = --------------------- mass, m v = u - a t where v = Final velocity u = Initial velocity t = time, Forces & Motion what about no change in motion? Resultant force = 0 velocity is unchanged - either at rest - or moving with a constant velocity, Direction of resultant force is perpendicular to motion how to find acceleration in such cases? v * v Acceleration, a = ------- r is called centripetal acceleration. r is the radius of the circle. m v*v Resultant force, F = -------- r, Resultant force or unbalanced force how does a resultant force change the direction of motion? Direction of resultant force is perpendicular to motion