* Reduced rolling resistance. When a car is stationary, the tires are in contact with the ground at a single point. This creates a lot of friction, which makes it difficult to push the car. However, when the car is in motion, the tires are rolling, which reduces the amount of friction between the tires and the ground. This makes it easier to push the car.
* Inertia. An object in motion tends to stay in motion. This means that once the car is moving, it will continue to move in the same direction unless something stops it. This makes it easier to push the car, as you don't have to overcome the inertia of the car to get it moving.
* Momentum. Momentum is the mass of an object multiplied by its velocity. A car in motion has momentum, which makes it easier to push. This is because the momentum of the car will help to overcome the friction between the tires and the ground.
In addition to these factors, it is also easier to push a car once already in motion because the driver can use the momentum of the car to help push it. The driver can do this by leaning forward and pushing against the steering wheel, which will help to propel the car forward.
Overall, there are a number of reasons why it is easier to push a car once already in motion. These factors include reduced rolling resistance, inertia, and momentum.
