# What is the relationship between speed and friction?

## What is the relationship between speed and friction?

There the frictional force is proportional to the velocity for small velocities. That proportionality breaks down when the velocity becomes larger. In particular, it breaks down (and the drag goes up more rapidly) when something called the Reynolds’ number becomes large.

## Does friction increase with mass?

Friction increases with mass because friction depends on the normal force, which is related to the weight of an object, which depends on mass.

## How is friction increased?

There are two methods of increasing friction: one is by making the surfaces rough and the other by increasing the mass of the object that is moving. For example, the tyres of vehicles have treads (these are the ‘designs’ that you can see on the tyre surface), which increase the friction between the tyre and the road.

## What are 2 ways friction can be reduced?

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.

## How is friction force Minimised?

By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.

## Is rolling friction higher than static friction?

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.

## Why is static friction the strongest?

Static friction keeps the box from moving until the applied force (F) exceeds the static friction force (fs). Because these individual areas of contact are very small, the pressure (pressure = force ÷ area) between the surfaces at these points is very high.

## Why is rolling friction static?

Rolling friction is the frictional force that occurs when one object rolls on another, like a car’s wheels on the ground. This is classified under static friction because the patch of the tire in contact with the ground, at any point while the tire spins, is stationary relative to the ground.

## Is friction always necessary for rolling?

The force due to friction doesn’t necessarily act to oppose the motion of the body but acts to oppose slipping or sliding along the contact surface. A body can roll without slipping. Likewise, torques due to friction don’t necessarily oppose the rotation of a body (consider a wheel or pulley being driven by a belt).

## Does friction affect rolling?

Friction maintains accelerated rolling. The motion of a rolling body is altered due to external force/ torque. This can happen in following ways : The line of action of external force passes through center of mass.

## Is rolling without slipping possible without friction?

If the ball is rolling without slipping at a constant velocity, the point of contact has no tendency to slip against the surface and therefore, there is no friction.

## Why is rolling friction less than sliding?

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.

## Which is faster rolling or sliding?

Since the sliding object has no angular velocity, its linear velocity is greater than that of the rolling object, and it reaches the bottom of the track faster. And if C < μk, the rolling object has a greater linear acceleration and wins the race to the bottom.

## What is easier rolling or sliding?

When an object rolls over the surface of another object ,the resistance to its motion is called rolling friction. It is always easier to roll than to slide an object over another object.So rolling friction is much less than the sliding friction.

## Is rolling friction less than fluid friction?

Yes fluid friction is smaller than rolling friction.

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