Give some examples of static force and fluid force.
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Explanation:
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Static Friction Examples
Papers on a tabletop.
A towel hanging on a rack.
A bookmark in a book.
A car parked on a hill.
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Fluid friction is friction that acts on objects that are moving through a fluid. A fluid is a substance that can flow and take the shape of its container. Fluids include liquids and gases. If you've ever tried to push your open hand through the water in a tub or pool, then you've experienced fluid friction.
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Friction is defined as the force that opposes the motion of a solid object over another. There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction. Friction and normal force are directly proportional to the contacting surfaces and it doesn’t depend on the hardness of the contacting surface. With the increase in relative speeds, the sliding friction reduces whereas fluid friction increases with the increase in the relative speed, also fluid friction is dependent on the viscosity of the fluid .
Types Of Friction
Following are the friction types which depend on the types of motion:
Static FrictionSliding FrictionRolling FrictionFluid FrictionStatic Friction
Static friction is defined as the frictional force that acts between the surfaces when they are at rest with respect to each other.
The magnitude of the static force is equal in the opposite direction when a small amount of force is applied. When the force increases, at some point maximum static friction is reached.
Static Friction Examples
Following are the examples of static friction:
- Skiing against the snow
- Creating heat by rubbing both the hands together
- Table lamp resting on the table
Coefficient Of Static Friction
The coefficient of static friction is denoted as µs. The maximum force of static friction is given as the product of the coefficient of static friction and normal force and force of static friction is less than or equal to the product of the coefficient of static friction and normal force. It is given as:
Fs max = µs η and Fs ≤ µs η
Where,
Fs is the force of static frictionµs is the coefficient of static frictionη is the normal forceFs max is the maximum force of static friction.
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