Oct 12, 2007 · It is directly proportional to that. Now when once motion starts Momentum comes into effect. Now instead of producing whole effect of weight downwards as in case of static friction, as per law of momentum it would produce its effect in direction of velocity, this way supporting the applied force P.
A block of mass m = 5.00 kg is pulled along a horizontal frictionless floor by a cord that exerts a force of magnitude F = 12.0 N at an angle {eq}\displaystyle \theta = 30.0^o.