Friction and velocity have no connection what do ever. Friction increased as the normal force on the object increased. Reaction force is the force by the surface on the object perpendicular to it’s motion. So if we apply force on the sliding block perpendicular to it’s direction of motion, friction will increase.

Methods for decreasing friction:

• Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
• Lubrication is another way to make a surface smoother.
• Make the object more streamlined.
• Reduce the forces acting on the surfaces.
• Reduce the contact between the surfaces.

Normal force ( F N F_N FN​F, start subscript, N, end subscript): squeezing surfaces together more tightly increases the friction.

Friction can slow things down and sometimes make things go faster because of the grip that it causes. STATIC FRICTION is the force that will resist the movement up until it is overcome by a greater force and the motion occurs.

Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer.

Frictional force can accelerate a body.

Friction acts opposite to the direction of the original force. The frictional force is equal to the frictional coefficient times the normal force. Friction is caused due to attractive forces between the molecules near the surfaces of the objects. There is a separate coefficient for both static and kinetic friction.

Sliding friction is the force resisting the motion when a body slides on a surface. The force of friction depends on the area of contact between the two surfaces. As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction.

Rolling friction is weaker because basically, it is rolling. The rolling motion or cyclical motion allows it to move, change direction, or change speed more easily. Rolling something is better at overcoming the resistance force. Less effort is needed to move an object that has wheels than a flat object.

The force resisting the motion of a rolling body on a surface is known as rolling friction or rolling resistance. Rolling of ball or wheel on the ground is an example of Rolling friction. The other type of friction is sliding friction.

Explanation: Look, friction can be broadly classified into three types, rolling, sliding, and static. The value of static friction is always the greatest among these 3. As you said, the value of Static friction may or may not be exactly 10 times of the Rolling friction, but it is always greater.

rolling friction

There are several ways to reduce friction:

1. The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example.
2. Replace sliding friction with rolling element friction, such as with the use of rolling element bearings.

Rolling friction occurs when a wheel, ball, or cylinder rolls freely over a surface, as in ball and roller bearings. The main source of friction in rolling appears to be dissipation of energy involved in deformation of the objects.

Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. In analogy with sliding friction, rolling resistance is often expressed as a coefficient times the normal force.

Rolling friction is the resistive force that slows down the motion of a rolling ball or wheel. It is also called rolling resistance. Once it is rolling, the resistance to the motion is typically a combination of several friction forces at the point of contact between the wheel and the ground or other surface.

Rolling friction is always less than static friction because in order for an object to roll the force of friction between it and surface must be large enough to keep the object from sliding. Hence rolling friction is always greater than static force.