FRICTION
by Nora Almazrouei
Friction is the resistance of motion when one object is moving relative to another. Scientists think it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
Here are three types of friction, static friction, kinetic friction, and rolling friction.
(click on the gifs to learn more about each one!)
Kinetic Friction
Kinetic friction is a force that acts between moving surfaces. As you can see in the animation above, the box that is being pushed across the surface experiences a force in the opposite direction of its movement. The magnitude of the force depends on the coefficient of kinetic friction between the two materials.
Rolling Friction
Rolling friction occurs when an object is rolling across a surface. As shown in the animation above, you can see that the surfaces in contact don't rub against each other.
Static Friction
Static friction is the force of friction on an object that is not moving. In the animation above, you can see that the person is applying force but the box isn't moving which is the result of static friction.