A sledge of mass is pulled along a horizontal snow track by a constant horizontal force of
PHYSICS · Subjective · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
A sledge of mass 50kg is pulled along a horizontal snow track by a constant horizontal force of 120N. The coefficient of kinetic friction between the sledge and the snow is 0.15. In addition, the sledge experiences a constant resistive force of 20N due to air.
(i) Write an expression for the net horizontal force acting on the sledge.
(ii) If the sledge starts from rest, calculate the speed it attains after moving 40m along the track.
(iii) Determine what fraction of the total work done by the pulling force is dissipated as thermal energy.