Forces are very important to our world because they affect all of our movements. A force is a push or a pull. Another force which affects our motion is friction. Friction is often helpful. An example is when we put snow tires on our car to gain traction.
Friction is harmful when it slows our movement by increasing the force needed to move an object.
An example of harmful friction is trying to push a load of bricks across a very rough surface. Newton's first law of motion is also called the Law of Inertia. Inertia is the tendency an object has to resist a change in motion or position. All matter has inertia. Your inertia will keep you sitting in your seat unless a force pushes you out or you voluntarily decide to move.