Learn Science Friction , Class 8 Science Friction Exercise, Free Online Friction Lessons

Class 8 Science Study Material

An Educational platform for Preparation and Practice Class 8. Kidsfront provide unique pattern of learning Science with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Science for Class 8. This study material help Class 8, Science students in learning every aspect of Friction . Students can understand Friction concept easily and consolidate their learning by doing Online Practice Tests on Science, Friction chapter repeatedly till they excel in Class 8, Friction . Free ONLINE PRACTICE TESTS on Class 8, Friction comprise of Hundreds of Questions on Friction , prepared by the highly professionals team. Every repeat test of Friction will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Friction . Attempt ONLINE TEST on Class 8,Science, Friction in Academics section after completing this Friction Question Answer Exercise.

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Friction

A car slips on a wet road because the friction

a) Increases.
b) Decreases.
c) Remains same.
d) Becomes zero.

✔Answer

✔Solution

Correct Answer Is : Decreases.

Solution Is : Water makes the surface smooth and therefore, the friction gets reduced as compared to the road without water. Water makes the surface slippery and so the car slips.

The brake system of cars and bicycles are provided with

a) Ordinary rubbers.
b) Brake pads.
c) Wooden pads.
d) Plastic sheets.

✔Answer

✔Solution

Correct Answer Is : Brake pads.

Solution Is : To increase friction, break pads are provided in break system of bicycles and automobiles. While riding, the break pads do not touch the wheels, but when the break lever is pressed, these pads stop the motion of the rim.

Frictional force is

a) Contact force.
b) Non-contact force.
c) Muscular force.
d) Force applied by earth.

✔Answer

✔Solution

Correct Answer Is : Contact force.

Solution Is : Frictional force is any form of contact force in which the bodies experiencing the force are in physical contact with each other.

Friction cannot be reduced by

a) Polishing
b) Oiling
c) By using the ball bearing
d) If area of contact is less

✔Answer

✔Solution

Correct Answer Is : If area of contact is less

Solution Is : Using oiling, polishing and using the ball bearing can reduce friction between two bodies.

An example of contact force is

a) Magnetic force.
b) Electrostatic force.
c) Gravitational force.
d) Frictional force.

✔Answer

✔Solution

Correct Answer Is : Frictional force.

Solution Is : Friction force is a form of contact force as the bodies experiencing this force have to be in physical contact with each other. Magnetic, electrostatic and gravitational force act from a distance.

Rocket has a special streamlined body in order to

a) Increase fluid friction.
b) Reduce fluid friction.
c) Make them attractive.
d) Design purpose

✔Answer

✔Solution

Correct Answer Is : Reduce fluid friction.

Solution Is : A streamlined body is that in which the rocket has its front portion as pointed (narrower), with a broader middle portion and a tapered back. This shape reduces the air friction when the rocket is in motion. Hence, there is less energy required to overcome fluid friction.

Grooves in tyres

a) Increase friction between the tyre and the road.
b) Decrease friction between the tyre and the road.
c) Do not affect friction between the tyre and the road.
d) Make the tyre look good.

✔Answer

✔Solution

Correct Answer Is : Increase friction between the tyre and the road.

Solution Is : Grooves in tyres provide with a better grip with the ground, i.e., the area of contact increases, resulting in the increase in friction.

Burning of the meteor in the atmosphere is due to

a) Electrostatic force.
b) Magnetic force.
c) Frictional force.
d) Gravitational force.

✔Answer

✔Solution

Correct Answer Is : Frictional force.

Solution Is : Burning of the meteor in the atmosphere is due to frictional force because friction produces heat.

Fluid friction is independent of the

a) Speed of object.
b) Shape of object.
c) Nature of the fluid.
d) Colour of the fluid.

✔Answer

✔Solution

Correct Answer Is : Colour of the fluid.

Solution Is : Fluid friction only depends upon (i)the speed of the object with respect to the fluid; (ii)the shape of the object (iii)the nature of the fluid.

When an object moves through a liquid, it experiences

a) Static friction.
b) Sliding friction.
c) Fluid friction.
d) Rolling friction.

✔Answer

✔Solution

Correct Answer Is : Fluid friction.

Solution Is : When a body moves through a liquid, it experiences an opposing force due to the fluids(i.e., gases and liquids)which is called fluid friction.

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Class 8 Science Study Material

Friction

A car slips on a wet road because the friction

Correct Answer Is : Decreases.

Solution Is : Water makes the surface smooth and therefore, the friction gets reduced as compared to the road without water. Water makes the surface slippery and so the car slips.

The brake system of cars and bicycles are provided with

Correct Answer Is : Brake pads.

Solution Is : To increase friction, break pads are provided in break system of bicycles and automobiles. While riding, the break pads do not touch the wheels, but when the break lever is pressed, these pads stop the motion of the rim.

Frictional force is

Correct Answer Is : Contact force.

Solution Is : Frictional force is any form of contact force in which the bodies experiencing the force are in physical contact with each other.

Friction cannot be reduced by

Correct Answer Is : If area of contact is less

Solution Is : Using oiling, polishing and using the ball bearing can reduce friction between two bodies.

An example of contact force is

Correct Answer Is : Frictional force.

Solution Is : Friction force is a form of contact force as the bodies experiencing this force have to be in physical contact with each other. Magnetic, electrostatic and gravitational force act from a distance.

Rocket has a special streamlined body in order to

Correct Answer Is : Reduce fluid friction.

Solution Is : A streamlined body is that in which the rocket has its front portion as pointed (narrower), with a broader middle portion and a tapered back. This shape reduces the air friction when the rocket is in motion. Hence, there is less energy required to overcome fluid friction.

Grooves in tyres

Correct Answer Is : Increase friction between the tyre and the road.

Solution Is : Grooves in tyres provide with a better grip with the ground, i.e., the area of contact increases, resulting in the increase in friction.

Burning of the meteor in the atmosphere is due to

Correct Answer Is : Frictional force.

Solution Is : Burning of the meteor in the atmosphere is due to frictional force because friction produces heat.

Fluid friction is independent of the

Correct Answer Is : Colour of the fluid.

Solution Is : Fluid friction only depends upon (i)the speed of the object with respect to the fluid; (ii)the shape of the object (iii)the nature of the fluid.

When an object moves through a liquid, it experiences

Correct Answer Is : Fluid friction.

Solution Is : When a body moves through a liquid, it experiences an opposing force due to the fluids(i.e., gases and liquids)which is called fluid friction.

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