Force acting on a given area is called pressure.

Rolling friction is slightly lesser than the sliding friction.

A moving body comes to rest due to friction alone.

Rolling friction is slightly lesser than the sliding friction.

A body will sink if the weight of the body is greater than the buoyant force.

Rolling friction is slightly lesser than the sliding friction.

One atmosphere is equivalent to 1,00,000 newton force acting on one square metre.

Rolling friction is slightly lesser than the sliding friction.

Rolling friction is slightly greater than the sliding friction.

Rolling friction is slightly lesser than the sliding friction.

Friction is the only reason for the loss of energy.

Rolling friction is slightly lesser than the sliding friction.

Liquid pressure decreases with the decrease of depth.

Rolling friction is slightly lesser than the sliding friction.

Viscosity depends on the pressure of a liquid.

Using barometers, one can measure the atmospheric pressure.

Give two examples to verify that a force changes the shape of a body.

(i) Changes in balloon.(ii)Rubber band expands by pulling.

(i) Force applied to the ball at rest. (ii) Motion of wind mill by external force.

I feel warm (heat) because of frictional force.

Frictional force is produced due to the geometrical dissimilarities of the surface of the bodies, which are in relative motion.

Give two examples to verify that a force tends to change the static condition of a body.

(i) Force applied to the ball at rest. (ii) Motion of wind mill by external force.

(i) Changes in balloon.(ii)Rubber band expands by pulling.

I feel warm (heat) because of frictional force.

Frictional force is produced due to the geometrical dissimilarities of the surface of the bodies, which are in relative motion.

How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?

I feel warm (heat) because of frictional force.

(i) Changes in balloon.(ii)Rubber band expands by pulling.

(i) Force applied to the ball at rest. (ii) Motion of wind mill by external force.

Frictional force is produced due to the geometrical dissimilarities of the surface of the bodies, which are in relative motion.

How does the friction arise between the surfaces of two bodies in relative motion?

Frictional force is produced due to the geometrical dissimilarities of the surface of the bodies, which are in relative motion.

(i) Changes in balloon.(ii)Rubber band expands by pulling.

(i) Force applied to the ball at rest. (ii) Motion of wind mill by external force.

I feel warm (heat) because of frictional force.

Name two instruments which help to measure the pressure of a fluid.

(i) Changes in balloon.(ii)Rubber band expands by pulling.

(i) Force applied to the ball at rest. (ii) Motion of wind mill by external force.

I feel warm (heat) because of frictional force.

Define one atmosphere.

The pressure exerted by this mercury column is considered as the pressure of magnitude 'one atmosphere'(1 atm).

Broader straps are provided on a back pack for giving a lower pressure on the shoulders by providing a larger area of contact with the shoulder.

Water molecules rise up due to surface tension.

« Oil has greater viscosity. « Each liquid moves with a different speed. « Honey flows faster than oil due to its low viscosity.

Why are heavy bags provided with broad straps?

Broader straps are provided on a back pack for giving a lower pressure on the shoulders by providing a larger area of contact with the shoulder.

The pressure exerted by this mercury column is considered as the pressure of magnitude 'one atmosphere'(1 atm).

Water molecules rise up due to surface tension.

« Oil has greater viscosity. « Each liquid moves with a different speed. « Honey flows faster than oil due to its low viscosity.

How does surface tension help a plant?

Water molecules rise up due to surface tension.

The pressure exerted by this mercury column is considered as the pressure of magnitude 'one atmosphere'(1 atm).

Broader straps are provided on a back pack for giving a lower pressure on the shoulders by providing a larger area of contact with the shoulder.

« Oil has greater viscosity. « Each liquid moves with a different speed. « Honey flows faster than oil due to its low viscosity.

Which has greater viscosity, oil or honey? Why?

« Oil has greater viscosity. « Each liquid moves with a different speed. « Honey flows faster than oil due to its low viscosity.

The pressure exerted by this mercury column is considered as the pressure of magnitude 'one atmosphere'(1 atm).

Broader straps are provided on a back pack for giving a lower pressure on the shoulders by providing a larger area of contact with the shoulder.

Water molecules rise up due to surface tension.

Define friction. Give two examples of the utility of friction in day to day life.

Frictional force or friction arises when two or more bodies in contact move or tend to move, relative to each other. (i) a knot in a thread. (Ii)Wheels provided in vehicles.

(i) Decreasing the area of contact.(ii) Using lubricants.(iii) Using ball bearing.

During a heavy storm, sailors pour soap powder or oil into the sea near their ship to decrease the surface tension of sea water. This process reduces the impact of the violent water current against the all of ship.

In an automobile service station, the vehicles are lifted upward using the hydraulic lift, which works as per Pascal's law.The automobile brake system works according to Pascal's law.The hydraulic press is used to make the compressed bundles of cotton or cloth so as to occupy less space.

Give the different types of friction and explain each with an example.

(i) Decreasing the area of contact.(ii) Using lubricants.(iii) Using ball bearing.

Frictional force or friction arises when two or more bodies in contact move or tend to move, relative to each other. (i) a knot in a thread. (Ii)Wheels provided in vehicles.

During a heavy storm, sailors pour soap powder or oil into the sea near their ship to decrease the surface tension of sea water. This process reduces the impact of the violent water current against the all of ship.

In an automobile service station, the vehicles are lifted upward using the hydraulic lift, which works as per Pascal's law.The automobile brake system works according to Pascal's law.The hydraulic press is used to make the compressed bundles of cotton or cloth so as to occupy less space.

Describe an experiment to prove that friction depends on the nature of a surface.

During a heavy storm, sailors pour soap powder or oil into the sea near their ship to decrease the surface tension of sea water. This process reduces the impact of the violent water current against the all of ship.

Frictional force or friction arises when two or more bodies in contact move or tend to move, relative to each other. (i) a knot in a thread. (Ii)Wheels provided in vehicles.

(i) Decreasing the area of contact.(ii) Using lubricants.(iii) Using ball bearing.

In an automobile service station, the vehicles are lifted upward using the hydraulic lift, which works as per Pascal's law.The automobile brake system works according to Pascal's law.The hydraulic press is used to make the compressed bundles of cotton or cloth so as to occupy less space.

Explain how friction can be minimised.

In an automobile service station, the vehicles are lifted upward using the hydraulic lift, which works as per Pascal's law.The automobile brake system works according to Pascal's law.The hydraulic press is used to make the compressed bundles of cotton or cloth so as to occupy less space.

Frictional force or friction arises when two or more bodies in contact move or tend to move, relative to each other. (i) a knot in a thread. (Ii)Wheels provided in vehicles.

(i) Decreasing the area of contact.(ii) Using lubricants.(iii) Using ball bearing.

During a heavy storm, sailors pour soap powder or oil into the sea near their ship to decrease the surface tension of sea water. This process reduces the impact of the violent water current against the all of ship.

Friction is a necessary evil - Explain.

We can hold any object in our hand due to frictionWe can walk on the road because of friction. The footwear and the ground help us to walk without slipping.Writing easily with a pen on paper is due to friction.Automobiles can move safely due to friction between the tyres and the road. Brakes can be applied due to frictional resistance on brake shoes.We are able to light a matchstick, sew clothes, tie a knot or fix a nail in the wall because of friction.Though it is giving a negative effect, in most of our day to day life friction helps us to make our life easy. So, it is called as "necessary evil".

Types of friction :Static friction:Friction can be classified into two basic types: static friction and kinetic friction.The friction experienced by the bodies,which are at rest is called static friction. (E.g.: all the objects rigidly placed to be at rest on the Earth, a knot in a thread.) 2. Kinetic friction Friction existing during the motion of bodies is called kinetic friction.Further, kinetic friction can be classified into two: sliding friction and rolling friction.(i) Sliding friction When a body slides over the surface of another body, the friction acting between the surfaces in contact is called sliding friction.(ii) Rolling friction: When a body rolls over another surface, the friction acting between the surfaces in contact is called rolling friction.Rolling friction is less than sliding friction. That is why wheels are provided in vehicles, trolleys, suitcases etc.

Arrange some notebooks one over the other to form a platform, on a table.Keep a wide scale, as a slide, such that one of its endsrests on the pile of books.Take different kinds of materials like cotton cloth, plastic paper, newspaper, writing pad etc.Place some glass marbles in a bowl placed on the table.First, keep a rectangular piece of paper near the end ofthe scale, which is in contact with the table.

Using lubricants:A substance, which reduces the frictional force, is called a lubricant. E.g.: grease, coconut oil, graphite, castor oil,etc. The lubricants fill up the gaps in the irregular surfaces between the bodies in contact. This provides a smooth layer thus preventing a direct contact between their rough surfaces.Using ball bearing:Since, the rolling friction is smaller than sliding friction,sliding is replaced by rolling with the usage of ball bearings.We can see lead shots in the bearing of a cycle hub.

Give the different types of friction and explain each with an example.

Types of friction :Static friction:Friction can be classified into two basic types: static friction and kinetic friction.The friction experienced by the bodies,which are at rest is called static friction. (E.g.: all the objects rigidly placed to be at rest on the Earth, a knot in a thread.) 2. Kinetic friction Friction existing during the motion of bodies is called kinetic friction.Further, kinetic friction can be classified into two: sliding friction and rolling friction.(i) Sliding friction When a body slides over the surface of another body, the friction acting between the surfaces in contact is called sliding friction.(ii) Rolling friction: When a body rolls over another surface, the friction acting between the surfaces in contact is called rolling friction.Rolling friction is less than sliding friction. That is why wheels are provided in vehicles, trolleys, suitcases etc.

We can hold any object in our hand due to frictionWe can walk on the road because of friction. The footwear and the ground help us to walk without slipping.Writing easily with a pen on paper is due to friction.Automobiles can move safely due to friction between the tyres and the road. Brakes can be applied due to frictional resistance on brake shoes.We are able to light a matchstick, sew clothes, tie a knot or fix a nail in the wall because of friction.Though it is giving a negative effect, in most of our day to day life friction helps us to make our life easy. So, it is called as "necessary evil".

Arrange some notebooks one over the other to form a platform, on a table.Keep a wide scale, as a slide, such that one of its endsrests on the pile of books.Take different kinds of materials like cotton cloth, plastic paper, newspaper, writing pad etc.Place some glass marbles in a bowl placed on the table.First, keep a rectangular piece of paper near the end ofthe scale, which is in contact with the table.

Using lubricants:A substance, which reduces the frictional force, is called a lubricant. E.g.: grease, coconut oil, graphite, castor oil,etc. The lubricants fill up the gaps in the irregular surfaces between the bodies in contact. This provides a smooth layer thus preventing a direct contact between their rough surfaces.Using ball bearing:Since, the rolling friction is smaller than sliding friction,sliding is replaced by rolling with the usage of ball bearings.We can see lead shots in the bearing of a cycle hub.

Describe an experiment to prove that friction depends on the nature of a surface.

Arrange some notebooks one over the other to form a platform, on a table.Keep a wide scale, as a slide, such that one of its endsrests on the pile of books.Take different kinds of materials like cotton cloth, plastic paper, newspaper, writing pad etc.Place some glass marbles in a bowl placed on the table.First, keep a rectangular piece of paper near the end ofthe scale, which is in contact with the table.

We can hold any object in our hand due to frictionWe can walk on the road because of friction. The footwear and the ground help us to walk without slipping.Writing easily with a pen on paper is due to friction.Automobiles can move safely due to friction between the tyres and the road. Brakes can be applied due to frictional resistance on brake shoes.We are able to light a matchstick, sew clothes, tie a knot or fix a nail in the wall because of friction.Though it is giving a negative effect, in most of our day to day life friction helps us to make our life easy. So, it is called as "necessary evil".

Types of friction :Static friction:Friction can be classified into two basic types: static friction and kinetic friction.The friction experienced by the bodies,which are at rest is called static friction. (E.g.: all the objects rigidly placed to be at rest on the Earth, a knot in a thread.) 2. Kinetic friction Friction existing during the motion of bodies is called kinetic friction.Further, kinetic friction can be classified into two: sliding friction and rolling friction.(i) Sliding friction When a body slides over the surface of another body, the friction acting between the surfaces in contact is called sliding friction.(ii) Rolling friction: When a body rolls over another surface, the friction acting between the surfaces in contact is called rolling friction.Rolling friction is less than sliding friction. That is why wheels are provided in vehicles, trolleys, suitcases etc.

Using lubricants:A substance, which reduces the frictional force, is called a lubricant. E.g.: grease, coconut oil, graphite, castor oil,etc. The lubricants fill up the gaps in the irregular surfaces between the bodies in contact. This provides a smooth layer thus preventing a direct contact between their rough surfaces.Using ball bearing:Since, the rolling friction is smaller than sliding friction,sliding is replaced by rolling with the usage of ball bearings.We can see lead shots in the bearing of a cycle hub.

Explain how friction can be minimised.

Using lubricants:A substance, which reduces the frictional force, is called a lubricant. E.g.: grease, coconut oil, graphite, castor oil,etc. The lubricants fill up the gaps in the irregular surfaces between the bodies in contact. This provides a smooth layer thus preventing a direct contact between their rough surfaces.Using ball bearing:Since, the rolling friction is smaller than sliding friction,sliding is replaced by rolling with the usage of ball bearings.We can see lead shots in the bearing of a cycle hub.

We can hold any object in our hand due to frictionWe can walk on the road because of friction. The footwear and the ground help us to walk without slipping.Writing easily with a pen on paper is due to friction.Automobiles can move safely due to friction between the tyres and the road. Brakes can be applied due to frictional resistance on brake shoes.We are able to light a matchstick, sew clothes, tie a knot or fix a nail in the wall because of friction.Though it is giving a negative effect, in most of our day to day life friction helps us to make our life easy. So, it is called as "necessary evil".

Types of friction :Static friction:Friction can be classified into two basic types: static friction and kinetic friction.The friction experienced by the bodies,which are at rest is called static friction. (E.g.: all the objects rigidly placed to be at rest on the Earth, a knot in a thread.) 2. Kinetic friction Friction existing during the motion of bodies is called kinetic friction.Further, kinetic friction can be classified into two: sliding friction and rolling friction.(i) Sliding friction When a body slides over the surface of another body, the friction acting between the surfaces in contact is called sliding friction.(ii) Rolling friction: When a body rolls over another surface, the friction acting between the surfaces in contact is called rolling friction.Rolling friction is less than sliding friction. That is why wheels are provided in vehicles, trolleys, suitcases etc.

Arrange some notebooks one over the other to form a platform, on a table.Keep a wide scale, as a slide, such that one of its endsrests on the pile of books.Take different kinds of materials like cotton cloth, plastic paper, newspaper, writing pad etc.Place some glass marbles in a bowl placed on the table.First, keep a rectangular piece of paper near the end ofthe scale, which is in contact with the table.

Describe an experiment to prove that the pressure in a liquid increases with depth.

Take a plastic bottle. Punch three holes on its side in thesame direction, but at differentheights. Now pour some waterinto it and let it flow through theholes. Observe the flow of water.Inference: The water comes out from all the holeswith a different force and falls on the table at points that are at variable distances from the bottle.

We can hold any object in our hand due to frictionWe can walk on the road because of friction. The footwear and the ground help us to walk without slipping.Writing easily with a pen on paper is due to friction.Automobiles can move safely due to friction between the tyres and the road. Brakes can be applied due to frictional resistance on brake shoes.We are able to light a matchstick, sew clothes, tie a knot or fix a nail in the wall because of friction.Though it is giving a negative effect, in most of our day to day life friction helps us to make our life easy. So, it is called as "necessary evil".

Types of friction :Static friction:Friction can be classified into two basic types: static friction and kinetic friction.The friction experienced by the bodies,which are at rest is called static friction. (E.g.: all the objects rigidly placed to be at rest on the Earth, a knot in a thread.) 2. Kinetic friction Friction existing during the motion of bodies is called kinetic friction.Further, kinetic friction can be classified into two: sliding friction and rolling friction.(i) Sliding friction When a body slides over the surface of another body, the friction acting between the surfaces in contact is called sliding friction.(ii) Rolling friction: When a body rolls over another surface, the friction acting between the surfaces in contact is called rolling friction.Rolling friction is less than sliding friction. That is why wheels are provided in vehicles, trolleys, suitcases etc.

Arrange some notebooks one over the other to form a platform, on a table.Keep a wide scale, as a slide, such that one of its endsrests on the pile of books.Take different kinds of materials like cotton cloth, plastic paper, newspaper, writing pad etc.Place some glass marbles in a bowl placed on the table.First, keep a rectangular piece of paper near the end ofthe scale, which is in contact with the table.

8TH FORCE AND PRESSURE

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OPEN ENDED QUESTION

a) Grease

b) Water

c) Coconut oil

d) Ghee

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8TH FORCE AND PRESSURE

NAME

If we apply force against the direction of motion of the body, then the body will

2. Pressure exerted by a liquid is increased by

Unit of pressure is

The value of the atmospheric pressure at sea level is

Pascal’s law is used in

Which of the following liquids has more viscosity?

7. The unit of viscosity is

The pressure of a liquid column __________ with the depth of the column.

Hydraulic lift works under the principle of __________.

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