Class 8 Exam > Class 8 Videos > Types of Friction
Types of Friction Video Lecture - Class 8
FAQs on Types of Friction Video Lecture - Class 8
| 1. What is friction? |  |
Ans. Friction is a force that opposes the motion of an object when it comes in contact with another object or surface. It acts in the opposite direction of the object's motion and can prevent or slow down its movement.
| 2. What are the different types of friction? | |
Ans. There are four types of friction:
1. Static Friction: This type of friction occurs when there is no relative motion between two objects in contact. It prevents an object from moving when a force is applied to it.
2. Sliding Friction: Sliding friction occurs when two solid surfaces slide over each other. It opposes the motion of the object and can be reduced by using lubricants.
3. Rolling Friction: Rolling friction occurs when an object rolls over a surface. It is typically less than sliding friction and can be further reduced by using ball bearings.
4. Fluid Friction: Fluid friction is the resistance offered by a fluid (liquid or gas) to the motion of an object. It depends on the shape and size of the object and the viscosity of the fluid.
| 3. How does friction affect the motion of an object? | |
Ans. Friction can affect the motion of an object in several ways:
- It can slow down or stop the motion of an object by opposing its movement.
- It can cause wear and tear on the surfaces in contact, leading to damage or loss of energy.
- Friction can also generate heat, especially when two surfaces rub against each other for an extended period.
- In some cases, friction can be useful, such as in the case of car brakes, where it helps to stop the vehicle by converting kinetic energy into heat energy.
| 4. How can we reduce friction? | |
Ans. Friction can be reduced by:
- Using lubricants like oil or grease between two surfaces in contact.
- Smoothening or polishing the surfaces to reduce roughness.
- Using ball bearings or wheels to convert sliding friction into rolling friction.
- Reducing the force or pressure between the surfaces in contact.
| 5. What are some examples of friction in everyday life? | |
Ans. Friction is encountered in various everyday activities, such as:
- Walking or running: Friction between our feet and the ground helps us to move forward.
- Writing with a pen or pencil: The friction between the pen tip and the paper allows us to make marks.
- Brakes in vehicles: Friction between the brake pads and the wheels helps to slow down or stop the vehicle.
- Using a matchstick: Friction between the matchstick and the matchbox surface ignites the match.
- Opening a door: Friction between the doorknob and our hand helps to turn the knob and open the door.
Text Transcript from Video
types of friction
introduction we do activities like
walking running and playing and in all
these activities fiction play an
important role you must have seen people
skiing on snow an interesting sport that
needs balancing and knowledge of
frictional force do you know that
frictional forces can be classified
based on its features let us find out
the various types of frictional force
objectives at the end of this lesson you
will be able to describe the types of
friction discuss advantages and
disadvantages of friction illustrate the
way to reduce or increase the friction
friction can be classified into four
types static friction sliding friction
rolling friction and fluid friction the
ball on ground is at rest at this point
static friction is acting on it the
frictional force that exists between the
two surfaces so long as they are
relatively at rest when an external
force acts is called static friction
there is no actual movement of the body
in static friction in static friction
force of static friction is equal to the
applied force static friction ends with
the beginning of sliding of the object
and Trust when we push the ball it
starts moving the frictional force
present when one body moves slowly or
slides over another body is known as
sliding friction once our body slides
the sliding friction is reduced a little
it is less than the static friction in
sliding friction the force of sliding
friction is equal to the constant pull
force you must have seen attaches and
other pieces of luggage fitted with
rollers if when a child can pull such
pieces of luggage
why is it so let us find out the rollers
reduce friction and roll on the objects
on rollers it is always easier to roll
than to slide a body over another that
is the reason it is convenient to pull
the luggages fitted with rollers the
force of friction between the rollers on
a body and the surface is called the
rolling friction rolling friction is
much less than the sliding friction
since the rolling friction is smaller
than the sliding friction sliding is
replaced in most machines by rolling by
the use of ball bearings common examples
are the use of ball bearings between
hubs and the axles of ceiling fans and
bicycles
introduction we do activities like
walking running and playing and in all
these activities fiction play an
important role you must have seen people
skiing on snow an interesting sport that
needs balancing and knowledge of
frictional force do you know that
frictional forces can be classified
based on its features let us find out
the various types of frictional force
objectives at the end of this lesson you
will be able to describe the types of
friction discuss advantages and
disadvantages of friction illustrate the
way to reduce or increase the friction
friction can be classified into four
types static friction sliding friction
rolling friction and fluid friction the
ball on ground is at rest at this point
static friction is acting on it the
frictional force that exists between the
two surfaces so long as they are
relatively at rest when an external
force acts is called static friction
there is no actual movement of the body
in static friction in static friction
force of static friction is equal to the
applied force static friction ends with
the beginning of sliding of the object
and Trust when we push the ball it
starts moving the frictional force
present when one body moves slowly or
slides over another body is known as
sliding friction once our body slides
the sliding friction is reduced a little
it is less than the static friction in
sliding friction the force of sliding
friction is equal to the constant pull
force you must have seen attaches and
other pieces of luggage fitted with
rollers if when a child can pull such
pieces of luggage
why is it so let us find out the rollers
reduce friction and roll on the objects
on rollers it is always easier to roll
than to slide a body over another that
is the reason it is convenient to pull
the luggages fitted with rollers the
force of friction between the rollers on
a body and the surface is called the
rolling friction rolling friction is
much less than the sliding friction
since the rolling friction is smaller
than the sliding friction sliding is
replaced in most machines by rolling by
the use of ball bearings common examples
are the use of ball bearings between
hubs and the axles of ceiling fans and
bicycles
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Dec 19, 2024 Last updated |
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