In the rear support phase, propulsion velocity depends on push-off which two factors?

In the rear support phase, propulsion velocity depends on push-off which two factors?

• A. Impulse and direction
• B. Force and timing
• C. Mass and velocity
• D. Magnitude and angle

Answer: (A)

The propulsion you generate during rear push-off comes from how you apply force to the ground and the direction of that force. The key idea is impulse—the amount of momentum change you induce by pushing off, which equals force times the time you spend in contact. A larger impulse means a larger forward change in velocity. But impulse isn’t just about strength; its direction matters too. The forward component of the impulse determines how much forward propulsion you gain, while any vertical or backward components can reduce forward speed or change your trajectory. So propulsion velocity depends on the size of the push-off impulse and the direction in which that impulse is applied.

The propulsion you generate during rear push-off comes from how you apply force to the ground and the direction of that force. The key idea is impulse—the amount of momentum change you induce by pushing off, which equals force times the time you spend in contact. A larger impulse means a larger forward change in velocity. But impulse isn’t just about strength; its direction matters too. The forward component of the impulse determines how much forward propulsion you gain, while any vertical or backward components can reduce forward speed or change your trajectory. So propulsion velocity depends on the size of the push-off impulse and the direction in which that impulse is applied.