A sled weighing 52 N is pulled horizontally
across snow. A penguin weighing 67.3N rides
on the sled,as in the figure. (sorry i can't provide the picture)
If the coefficient of static friction between
penguin and sled is 0.791, find the maximum
horizontal force that can be exerted on the
sled before the penguin begins to slide off.
The coefficient of kinetic friction between sled
and snow is 0.097.
Answer in units of N.
The Attempt at a Solution
i drew a force diagram for the sled and i figured out that:
Fnet(horizontal)= -friction of sled on penguin -friction of the snow on the sled + applied force= 0 newtons
i solved for the friction forces:
friction of sled on penguin= 67.3N * .791
friction of snow on sled= (52N + 67.3N) * .097
then i pluged those into my Fnet(horizontal) equation and solved for the applied force. i got 64.8064N as my final answer. when i entered this answer into the computer program that i use it said it was wrong. so i guess i am missing a step??