If a runner is accelerating along a flat race track, which statement is true?(1 point) Responses The normal force of the ground on the runner is greater than the gravitational force of the runner on the ground. The normal force of the ground on the runner is greater than the gravitational force of the runner on the ground. The gravitational force of the runner on the ground is greater than the normal force of the ground on the runner. The gravitational force of the runner on the ground is greater than the normal force of the ground on the runner. The drag on the runner from the air is greater than the running force provided by the runner. The drag on the runner from the air is greater than the running force provided by the runner. The running force provided by the runner is greater than the drag on the runner from the air.

Answer 1

To evaluate the statements regarding a runner who is accelerating along a flat race track, we need to consider the forces acting on the runner.

1. Normal Force vs. Gravitational Force: In the absence of vertical acceleration (since the runner is on a flat surface), the normal force exerted by the ground on the runner must equal the gravitational force acting on the runner. Therefore, the normal force is equal to the gravitational force; neither is greater than the other.

2. Drag Force vs. Running Force: When the runner accelerates, the horizontal force that propels the runner forward (the running force) must overcome not just the drag force but also provide the necessary net force for acceleration. Therefore, for the runner to be accelerating, the running force must be greater than the drag force.

Based on this analysis, the correct statement is:

The running force provided by the runner is greater than the drag on the runner from the air.