Question

Answer in a sentence or two.
1. Write two causes of friction.
2. Write two advantages of friction.
3. What is a spring balance?
4. How can we reduce friction?
5. Write two facts which determine the fluid friction.
Answer in 30-40 words.
1. Discuss kinetic friction and static friction in detail.
2. How can we increase and reduce friction?
3. What is fluid friction? Explain.
4. What is the difference between sliding and rolling frictions?​

Answer 1

1. deformation,surface roughness
2. increase: make surface rough decrease: make surface smooth
3. friction passes through solids and gases
4. Sliding; when object slides over surface of another object. Rolling ;when object rolls over surface of another object.

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Answer 2

Answer:

Explanation:

1. Causes of Friction. Friction is a force that resists the relative motion between two objects or materials. The causes of this resistive force are molecular adhesion, surface roughness, and deformations. Adhesion is the molecular force resulting when two materials are brought into close contact with each other.

2. Friction enables us to walk freely.

It helps to support ladder against wall.

It becomes possible to transfer one form of energy to another.

Objects can be piled up without slipping.

Breaks of vehicles work due to friction.

3. A spring scale or spring balance or newton meter is a type of mechanical force gauge or weighing scale. It consists of a spring fixed at one end with a hook to attach an object at the other.

4. Factors that determine the amount of fluid friction on a solid object include the viscosity of the fluid, the surface texture of the solid object and the shape of the object

Answer in 30-40 words.

• 1. Kinetic friction is defined as a force that acts between moving surfaces. A body moving on the surface experiences a force in the opposite direction of its movement. The magnitude of the force will depend on the coefficient of kinetic friction between the two material.
• Static friction is the friction that exists between a stationary object and the surface on which it's resting. Once the objects have already started moving, kinetic friction takes over. This is the friction that exists between two objects moving relative to each other.

2. 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.

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.

3. Fluid friction is the force that resists motion either within the fluid itself or of another medium moving through the fluid. There is internal friction, which is a result of the interactions between molecules of the fluid, and there is external friction, which refers to how a fluid interacts with other matter.

• 4. The term sliding friction refers to the resistance created by two objects sliding against each other. This can also be called kinetic friction. Sliding friction is intended to stop an object from moving.
• Rolling friction (or rolling resistance) is the resistive force that slows down the motion of a rolling ball or wheel. When a force or torque is applied to a stationary wheel, static rolling friction holds back the motion
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