Inertia is the resistance!

Inertia is anything that prevents an object from moving or changing direction. For example gravity is inertia it is always slowing down an object. Anything in or on an object is also inertia. For example a ton of big sticks in a wheelbarrow. All of those sticks are trying to prevent the wheelbarrow from moving. Mass and weight depends how much inertia there will be. For example a lot of weight and mass means a ton of inertia but a little bit of mass and weight means a little bit of inertia.