Suppose you have two carts, an empty cart and a cart full of bricks. The empty cart will speed up and move faster than the cart full of bricks. Otherwise, it will keep moving at a constant speed. So, a force is necessary to make things speed up or slow down, but not to stay moving with a constant speed. That means that things you see everyday do slow down and don't move at a constant speed if no other force is applied.
Weight is a force.
The pull of gravity on an object or a person is an acceleration. Weight and mass are often confused with one another. A weight of 9.8 N is the same as a mass of 1 kg multiplied by the gravitational acceleration of the Earth. Just remember, when most people say weight, what they really mean is mass. But you know now that the bananas really have a mass, not a weight, of 1 pound.