Which force propels you forward when you walk?

Which force propels you forward when you walk?

• A. The force applied to your feet by the floor
• B. The friction of your feet on the floor
• C. The force of the floor applied against your feet
• D. The normal force from the floor on your feet

Answer: (B)

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.