1 question

Question

1 question

anonymous · Answer

normal force from the ground on the sled

anonymous · Answer

i agree that it is normal force

anonymous · Answer

since this is a force diagram for the sled,
you dont care what forces act on the dogs
or what forces the dogs exert on other bodies

anonymous · Answer

moreover , in force diagrams we dont put velocity vectors.

gorv · Answer

we need to see the object ...not dog so  what other tell u is right  ..

theeric · Answer

This is multiple choice, so you can go through the options and eliminate those that aren't relevant.

Since this is the a force diagram for the sled, you're only worried about the forces on the $\it sled$. Everything the dogs do is summed up by $\overrightarrow F_a$.

Also, velocity plays no part in the picture of a force diagram!! What's left?

Normal force. And does it make sense? Yeah, otherwise gravitational force would be left unchallenged, bring the sled downwards like in freefall.