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Class-VIII
Science
Friction

Smitha

Jun 4, 2014

what are the advantage and disadvantage of friction?

ADVANTAGES OF FRICTION

Friction plays a vital role in our daily life. Without friction we are handicap.

1. It is becomes difficult to walk on a slippery road due to low friction. When we move...

Answer (12)
Class-VIII
Science
Friction

Letusknowwhy

Apr 8, 2014

Give examples to show that friction is both a friend and a foe.

Examples of friction as a friend:
  1. We can walk due to frictional forces between ground and our feet.
  2. We can  write on board or paper because of friction between the chal...

Answer (9)
Class-VIII
Science
Friction

Ratnadeep Mishra

Mar 9, 2015

 Explain, why rolling friction is less than sliding friction?

as area of contact is less in the case of rolling than in tha case of sliding

Answer (3)
Class-VIII
Science
Friction

Shreenidhi C

Jul 9, 2014

Why  do the cutting tools have sharp edges?

Why does the cutting edge of a knife made sharp?
 
Answer:  The cutting edges of tools like blades, knives etc., are provided with sharp edges to cut th...

Answer (1)
Class-VIII
Science
Friction

Arunabha Biswas

Jul 20, 2015

why the shape of an aeeroplane or a ship is streamlined?

The aeroplanes and ships have streamlined shaped bodies because they travel in fluids.  Fluids(either liquid or gas) exerts a force opposite to the direction of motion when an...

Answer (4)
Class-VIII
Science
Friction

Punmaram

Nov 14, 2013

why is it difficult to walk on a smooth or wet floor

Friction plays an important role while walking on any surface. On the wet surface the friction is very low than the normal walking surface as layer of water makes the floor smooth....

Answer (8)
Class-VIII
Science
Friction

Sanjeev Tiwari

Jul 9, 2015

Give two examples showing the harmful effects of friction.

Ans:
  1. Opposes motion of a body hence more energy is needed to overcome the friction.
  2. Producing the heart in moving parts of machines leads to wastage of energy.
  3. For...

Answer (2)
Class-VIII
Science
Friction

Sanjay Kumar

Sep 28, 2013

what is the difference between sliding and static friction?For a given pair of objects,which of the two is greater?

Static friction: 
Static friction is the friction which comes into play when surfaces of the objects are at rest relative to each other even there is an...

Answer (3)
Class-VIII
Science
Friction

Sanjeev Tiwari

Jul 9, 2015

Mention three simple methods of reducing friction.

Methods of Minimising Friction

The interlocking of irregularities on the surfaces of two bodies in contact, which cause friction, is overcome to a great extent by the use of lubr...

Answer (2)
Class-VIII
Science
Friction

Letusknowwhy

Apr 8, 2014

Objects moving in fluids must have special shapes. Why?

Fluids exerts a force opposite to the direction of motion when an object is moving in a fluid. This frictional force is known as drag. In order to decrease this drag the objects ar...

Answer (2)
Class-VIII
Science
Friction

Smitha

Jun 4, 2014

what are the advantage and disadvantage of friction?

ADVANTAGES OF FRICTION

Friction plays a vital role in our daily life. Without friction we are handicap.

1. It is becomes difficult to walk on a slippery road due to low friction. When we move...

Answer (12)
Class-VIII
Science
Friction

Letusknowwhy

Apr 8, 2014

Give examples to show that friction is both a friend and a foe.

Examples of friction as a friend:
  1. We can walk due to frictional forces between ground and our feet.
  2. We can  write on board or paper because of friction between the chal...

Answer (9)
Class-VIII
Science
Friction

Ratnadeep Mishra

Mar 9, 2015

 Explain, why rolling friction is less than sliding friction?

as area of contact is less in the case of rolling than in tha case of sliding

Answer (3)
Class-VIII
Science
Friction

Shreenidhi C

Jul 9, 2014

Why  do the cutting tools have sharp edges?

Why does the cutting edge of a knife made sharp?
 
Answer:  The cutting edges of tools like blades, knives etc., are provided with sharp edges to cut th...

Answer (1)
Class-VIII
Science
Friction

Arunabha Biswas

Jul 20, 2015

why the shape of an aeeroplane or a ship is streamlined?

The aeroplanes and ships have streamlined shaped bodies because they travel in fluids.  Fluids(either liquid or gas) exerts a force opposite to the direction of motion when an...

Answer (4)
Class-VIII
Science
Friction

Punmaram

Nov 14, 2013

why is it difficult to walk on a smooth or wet floor

Friction plays an important role while walking on any surface. On the wet surface the friction is very low than the normal walking surface as layer of water makes the floor smooth....

Answer (8)
Class-VIII
Science
Friction

Sanjeev Tiwari

Jul 9, 2015

Give two examples showing the harmful effects of friction.

Ans:
  1. Opposes motion of a body hence more energy is needed to overcome the friction.
  2. Producing the heart in moving parts of machines leads to wastage of energy.
  3. For...

Answer (2)
Class-VIII
Science
Friction

Sanjay Kumar

Sep 28, 2013

what is the difference between sliding and static friction?For a given pair of objects,which of the two is greater?

Static friction: 
Static friction is the friction which comes into play when surfaces of the objects are at rest relative to each other even there is an...

Answer (3)
Class-VIII
Science
Friction

Sanjeev Tiwari

Jul 9, 2015

Mention three simple methods of reducing friction.

Methods of Minimising Friction

The interlocking of irregularities on the surfaces of two bodies in contact, which cause friction, is overcome to a great extent by the use of lubr...

Answer (2)
Class-VIII
Science
Friction

Letusknowwhy

Apr 8, 2014

Objects moving in fluids must have special shapes. Why?

Fluids exerts a force opposite to the direction of motion when an object is moving in a fluid. This frictional force is known as drag. In order to decrease this drag the objects ar...

Answer (2)

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