Drag Force (Thrust) Forward Force

Balanced and Unbalanced Forces

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Resultant Force Resultant Force

When the force produced by the engine is transferred to the rear wheels (via the transmission system) the forces on the car are unbalanced and it accelerates.Drag forces, due to friction and air resistance, act in the opposite direction.The resultant force decreases and the acceleration decreases.When the forces acting on the car are balanced, the resultant force is zero. It stops accelerating and moves at a constant speed.When the brakes are applied, the drag force increases and the car decelerates.

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4060

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130140

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1600

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4060

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160180

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1 2 3 4 5 6 7Neutral

rpm x100

mph

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