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## Homework Statement

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.

## Homework Equations

Fnet=ma

## 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??