Question

1. Salim has a paper route. In the winter time, he puts his newspapers on a toboggan to pull them through the snow. The combined mass of the papers and the toboggan is 24 kg. The coefficient of static friction between the toboggan and the snow is 0.18. The coefficient of kinetic friction between the toboggan and the snow is 0.10.
2. With how much force must Salim pull in order to get the toboggan to start moving?
3. How much force is needed to keep the toboggan moving at a constant speed?

Answer 1

With how much force must Salim pull in order to get the toboggan to start moving?

$$F_1=\mu_smg\\ =\rm 24\: kg*9.8\: N/kg*0.18=42\; N$$

How much force is needed to keep the toboggan moving at a constant speed?

$$F_2=\mu_kmg\\ =\rm 24\: kg*9.8\: N/kg*0.10=24\; N$$