Why is it so hard to start a heavy object moving?

               Due to a force called inertia, an object will remain still or travel in a straight line unless some force interferes with it. Friction is one such force. The greater the mass of an object, the greater its inertia, and the bigger the force that will be needed to start it moving. This is why it is very difficult to move a stationary car by pushing it, but much easier once the car starts to roll. A very strong man is able to pull along a railway carriage once it has started to move. Inertia is the explanation for the magician’s trick of pulling a tablecloth off a table without disturbing the china and cutlery on it.

Picture credit: google