Strength is an inner ability.

Willpower is important for achieving goals.

The centrifugal force acts on the body in the direction away from the axis of rotation.

The centripetal force keeps the planets in orbit around the Sun.

This tractor has a horsepower of 100.

The purchasing power of the population has increased due to the improvement of the economic situation.

The workforce is a key factor for economic growth.

The Coriolis force affects the direction of winds on Earth.

We fought with their forces.