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Static friction, because your feet aren't (hopefully!) sliding.
Gravity in conjunction with friction.
Friction. Gravity holds us to the floor, friction keeps us from slipping.
You would start sliding forever or trip in an instant and would not be able to stand up and walk properly without holding onto an object. Because friction is what keeps your feet remain still on the ground.
The motion force
friction
Static friction, because your feet aren't (hopefully!) sliding.
Gravity in conjunction with friction.
no because you would be sliding if there was no friction.Friction resists the motion caused by another force
Friction. Gravity holds us to the floor, friction keeps us from slipping.
one can prevent sliding when walking along a wet sidewalk during rainy days by either swimming in the water, do a penguin walk, run fast, or by hopping( especially when wearing white)
Yes
When you walk it requires a force which is reacted by the floor in opposite direction. With zero friction it is difficult to make any forward progress as no force is reacted, so you cannot walk but will slip.You can try to put foot down always normal to the floor, and you make some progress, but mostly you will be sliding, not walking.
Teflon, Ice or an oiled surface.
To get places faster if there legs are tired Penguins slide on their bellies because they have short, thick and dense feet. That makes it hard to walk. According to the information I have read about, penguins love sliding on their bellies because it's easier to them. There for, it's hard to walk so sliding on their bellies is an easier way to transport.
I don't know for sure... probably the way they are shaped and the texture of your skin. Don't use this answer if you are looking for facts. I am just stating the obvious.
Those things on the opposite end of the legs to the body that prevent them having to walk on stumps.