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# Driving Forces and Resisting Forces This document discusses forces acting on an object in motion. ## Perpetual Uniform Motion The document notes that for an object to maintain a constant speed and direction in space, a force must be applied to oppose resistive forces. ## Three Types of Resisti...

# Driving Forces and Resisting Forces This document discusses forces acting on an object in motion. ## Perpetual Uniform Motion The document notes that for an object to maintain a constant speed and direction in space, a force must be applied to oppose resistive forces. ## Three Types of Resisting Forces The document lists three types of resistive forces: * Air resistance * Rolling resistance * Sliding resistance ## Calculating Air Resistance Air resistance ($F_{ra}$) can be calculated using the following formula: $F_{ra} = \frac{1}{2} \times CD \times P \times A \times V^{2}$ Where: * $F_{ra}$ = air resistance in N * CD = drag coefficient * P = air density in kg/m³ * A = frontal cross-sectional area in m² * V = speed of the object in m/s ## Newton's First Law The document mentions Newton's first law, stating that if the resultant force is zero, the object will remain at a constant velocity (which may be zero). If there is a non-zero resultant force, there will be acceleration.