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Q: What is the effect on coefficient of static friction when side length of a cube of 5 cm is doubled to original?

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Yes, Remember that: Friction = (Coefficient of Friction[static or kinetic])x(Normal Force) It's in a direct proportion.

there is no change.the coefficient of friction is independent of surface area.the matter will change only if normal reaction changes

No, It does not depends on weight of block because this weight of block is being balanced by normal force. So by increasing weight of block, there is no effect on coefficient of friction.

The force of friction is directly proportional to the weight of an object. The equation is Ffr=(coefficient of friction)FNsin(angle) where FN=m*g*cos(angle) and m*g is the object's weight.

The two factors are the coeffiecient of friction, and the 'normal' force, which is equal and opposite to the weight of the object. The coefficient of friction is diffeerent for different objects. Friction force = Coeff. X Normal Force

Friction is reduced between the tire and the road.Frictional Force = Coefficient of Friction x WeightThe weight of the car has not changed, however, the coefficient of friction has gone down ultimately reducing the available emergency stopping power of the car.The effect is referred to as Hydroplaning ; see related link .

its volume is also doubled...

A rectangle has two dimensions - length and width. Only if both dimensions are doubled, then the perimeter will be doubled.

what is the effect of friction force on plant

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Since the perimeter is a linear measure it is also doubled.

Nothing. The coefficient of friction is constant, as it is dependent on the surfaces that are interacting. Normal force increases as an objects mass increases (Be careful with the word "weight", as it denotes the effect of gravity) in a constant gravitational field. This normal force is what causes an increase in friction.

effect on inertia of a body if force is double?

The salary for the President was first set at $25,000 per year. The figure stayed in effect until 1869 when it doubled to $50,000.

Resistance !

No

Friction will reduce an object's speed.

it rubs the steel because its friction!

No effect

The effect of friction on motion will be an opposition to the motion. If friction is zero then the very movement vanishes. That is, a wheel cannot roll on the floor.

The size of the country doubled

Its energy is doubled.

The size of the country doubled

If there is more friction with a machine, efficiency is less.

more friction = less speed