Muscle, and gravity
The effort arm of a lever supplies the force to move something by applying an input force that is greater or lesser than the resistance being moved. This force is transmitted through the lever to overcome the resistance or load.
muscles
The gravitational force between planets supplies the centripetal force that causes them to orbit each other.
friction
It had a work force of 6,543 in 2000
c
The centripetal force is supplied by the tension in a string, gravitational force, friction, or any force pointing towards the center of the circular motion that keeps an object moving in a curved path.
The friction between the tires and the road surface supplies the centripetal force needed for a car to turn a corner on a valid road. The tires grip the road and create a frictional force that acts towards the center of the turn, allowing the car to change direction.
Centripetal force, which keeps planets in orbit around the sun, does not require physical supplies but rather results from the gravitational attraction between the sun and the planets. This force is generated by the mass of the sun and the planets, along with their velocities. The balance between gravitational pull (centripetal force) and the planets' inertia allows them to maintain stable orbits. Essentially, the energy and mass of celestial bodies are the "supplies" that facilitate this gravitational interaction.
false
Half of the British Commonwealth decided to airlift in food and supplies, and the Soviets weren't going to start WWIII just yet by shooting down civilian aircraft that are delivering supplies, so they just decided not to screw around with them too much. >> The Soviet blockade of Berlin was thwarted by a combined effort of the US Air Force , Royal Air Force , Royal Australian Air Force , Royal Canadian Air Force , Royal New Zealand Air Force and South African Air Force who , collectively , lifted the siege by flying in enough supplies to sustain the city of Berlin . ~ see related link below .
President Truman did this to prevent Stalin from taking over the city. Stalin blocked supplies to Berlin to force the US and British to abandon it.