NCERT Important Questions Class 8 Science chapter 9 with Answer solution with pdf. Here We Provides Class 1 to 12 all Subjects NCERT Solution with Notes, Question Answer, CBSE and HBSE Important Questions, MCQ and old Question Papers for Students.
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CBSE and HBSE Solution of Class 8 Science chapter 9 Friction important Questions And Answer solution.
Class 8 Science Chapter 9 Important Questions and Answer
Q.1 What is Friction?
Ans – The force that opposes the applied force on an object is called friction. Every motion has a force of friction.
Q.2 What factors affect force of friction?
Ans – There are the following factors that can affect frictional force.
- Shape of an object
- Weight of an object
- Roughness of an object
- Size of an object
- State of an object like solid, liquid and gas.
- Force applied on an object
Q.3 What is rolling friction?
Ans – When one body rolls over another body and during this the applied friction is called rolling friction. Example – the Ball bearing is used in machines to reduce friction.
Q.4 What is Sliding friction?
Ans – When an objects slide over another object is called sliding friction. This friction is much higher than rolling friction.
Q.5 What is fluid?
Ans – Fluid is a mixture of liquid and gases. The common name of liquid and gases is fluid.
Q.6 What is Lubricants?
Ans – Lubricants is the oily material that helps in reducing the friction of an object. It is used in the vehicle.
Q.7 Why Friction is necessary for us?
Ans – Friction force help us in our day to day activities. here are the following benefits of friction.
- Friction helps us in motion
- Friction helps us in writing
- Friction helps us in Hold any object
Q.8 What are the disadvantages of friction?
Ans – Friction have many disadvantages in our life. Let’s know one by one.
- Friction tear shoes.
- Friction produces heat that damage material
- Friction increase the energy of motion
Q.9 Why we fall when put a step on a banana peel? ( Most Important )
Ans – When we step on Banana peel than our friction force reduced due to smoothness of banana peel. So we fall after step on a banana peel.
Q.10 What is Fluid Friction?
Ans – Friction applied by liquid and gases are known as fluid friction.