Which force propels you forward when you walk?

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Multiple Choice

Which force propels you forward when you walk?

Explanation:
Propulsion while walking comes from friction between your foot and the floor. When you push your foot backward against the floor, the floor responds with a forward friction force on your foot. This forward friction is what accelerates you and moves you ahead. The normal force from the floor acts vertically to support your weight, not to push you forward. The other descriptions mix in vertical support or the overall contact force, but the horizontal push that drives you comes from friction.

Propulsion while walking comes from friction between your foot and the floor. When you push your foot backward against the floor, the floor responds with a forward friction force on your foot. This forward friction is what accelerates you and moves you ahead. The normal force from the floor acts vertically to support your weight, not to push you forward. The other descriptions mix in vertical support or the overall contact force, but the horizontal push that drives you comes from friction.

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