Friction 8

Question 1

The first person to create laws of friction

Answer 1

Leonardo da Vinci

Question 2

Amontons’ First Law: The force of friction is directly proportional to the applied load.
Amontons’ Second Law: The force of friction is independent of the apparent area of contact.
Coulomb’s Law of Friction: Kinetic friction is independent of the sliding velocity.

Answer 2

Amonton means Vinci’s

Question 3

Coefficient of force is

Answer 3

The ratio between the force of friction and normal force is called coefficient of friction. It is usually situated between 0 and 1 , sometimes it is more than 1

Question 3

What is coefficient of friction

Answer 3

A coefficient of friction is a value that shows the relationship between the force of friction between two objects and the normal reaction between the objects that are involved.

Question 4

Powder applied on carrom board

Answer 4

Talcum powder

Question 5

Frictional force exerted by fluids

Answer 5

Drag

Question 6

Powder in machines to reduce friction

Answer 6

Graphite

Question 7

Frictional force is defined as a force resisting the relative motion of two bodies. The bodies are pressed against each other with the Normal Force. Then, coefficient of friction = Friction Force divided by Normal Force.

Answer 7

Wowwwwwwww-) I didn’t know that

Question 8

Kinetic friction and static friction formula is

Answer 8

Coefficient of friction x normal force

Question 9

Name a lubricant between two surfaces

Answer 9

Soap solution , oil ,grease , boric acid