Question

What kinds of friction do you know and explain with suitable
A book placed on the surface of a table. The book is pushed in one
Give few examples for Sliding friction. (AS)
4. Explain how does lubrication reduces friction? (AS)
Reflections on concepts
1.
2.
forces acting on the book and explain . (AS,)
3.
5. Explain with one example that Frictional force is proportional to
(AS)
Application of concepts
1.
2.
Explain why do sportsmen use shoes with spikes?(AS,)
Would it be easier or difficult for you to walk on a marble fl
Why? (AS)
3.
What happens if we do not reduce friction in machines? (A
What purposes are surved by using bearings in machines
examples. (AS)
5. Draw a free body diagram (FBD) to show various forces
sliding on an inclined plane. (ASK)
4.
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Answer 1

Answer:

What kinds of friction do you know and explain with suitable

A book placed on the surface of a table. The book is pushed in one

Give few examples for Sliding friction. (AS) ?

• Sliding Friction: Sliding friction is friction that acts on objects when they are sliding over a surface. Sliding friction is weaker than static friction. That's why it's easier to slide a piece of furniture over the floor after you start it moving than it is to get it moving in the first place. Sliding friction can be useful. For example, you use sliding friction when you write with a pencil. The pencil "lead" slides easily over the paper, but there's just enough friction between the pencil and paper to leave a mark.

4. Explain how does lubrication reduces friction? (AS)

• Lubrication reduces the heat generated when two surfaces are in motion. It smoothes the process by forming a film between two surfaces that reduces friction and thus improves performance and efficiency. There are different variety of lubricants and oils available such as Engine Oil, Hydraulic Oil, and Greases

Reflections on concepts

• The incident ray, the reflected ray and the normal (at the point of incidence) , all lie in the same plane. The angle of incidence is equal to the angle of reflection

5. Explain with one example that Frictional force is proportional to

(AS)

1. As you can see in the figure the force with which be gold ingot presses against the ground in this situation is just its normal force is the force pushing the two surfaces together and the stronger the normal force the stronger the force due to friction

Explain why do sportsmen use shoes with spikes?(AS,)

Would it be easier or difficult for you to walk on a marble fl

Why? (AS)

• As you can see in the figure the force with which be gold ingot presses against the ground in this situation is just its normal force is the force pushing the two surfaces together and the stronger the normal force the stronger the force due to friction

What happens if we do not reduce friction in machines? (A

What purposes are surved by using bearings in machines

examples. (AS)

• A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts. Most bearings facilitate the desired motion by minimizing friction. Bearings are classified broadly according to the type of operation, the motions allowed, or to the directions of the loads (forces) applied to the parts.

5. Draw a free body diagram (FBD) to show various forces

sliding on an inclined plane. (ASK)

• Please refer the attachment

Explanation:

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