# How does friction affect motion?

Friction can slow things down and prevent stationary things from moving. In a frictionless world, more objects would slip, it would be difficult to wear clothes and shoes on, and it would be very difficult for people or cars to move or change direction. How does friction affect movement? Friction always opposes motion and slows down the speed at which the object moves on the surface. It will convert some of the kinetic energy of an object into thermal energy, thus reducing speed.

Friction tends to slow down the movement of an object. Friction is a force between objects that opposes the relative motion of objects. In this project, you will study kinetic friction (also called slip friction). When two objects move relative to each other, kinetic friction converts part of the kinetic energy of that movement into heat.

You can feel the warmth of kinetic friction if you rub your hands. When you brake suddenly and slip, the friction acts in the opposite direction to the direction in which you skidded, helping to stop the skidding completely. Once you start pressing it, to set it in motion, you must overcome the static friction that prevents the box from moving. Less force is needed to overcome frictional force on a smooth surface, and greater force is needed to overcome greater frictional force on a rough surface.

But what does friction do to a moving object? When an object is already moving relative to a surface, the frictional force will affect the movement. Since friction is the result of the forces of attraction between the surfaces of objects, the amount of friction depends on the materials of those two interacting objects. As the box is pushed across the floor or down the slide, friction occurs between the surfaces, which helps to slow down or stop the movement that is taking place. The amount of friction depends on the two materials involved, taking into account their size, surface, acceleration and direction.

Friction occurs in the opposite direction of movement and, because of this, it is a force that affects the movement of objects. By completing this lesson, you will be able to understand what friction is, how it works, and be able to describe the two types of friction that exist on Earth. When two objects rub together, attractive forces are activated between the molecules of the objects, causing friction. Static friction occurs when the two objects are at rest, which prevents that movement from occurring in the first place.

When you push a box across the floor, friction acts against the box in the opposite direction of the box's movement. Sit on the top and you won't go anywhere until you try hard enough to overcome the static friction at the top.