Friction due to fluids is called.
- AForce
- BPressure
- CFriction
- ✓Drag
Answer: D.
View full solution →Question types
Friction question types
382 questions across 10 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
382
Questions
10
Question groups
5
Question types
01
M.C.Q. [I MARKS]
221 Q→02Give the definition [1 M]
9 Q→03Fill in the blanks: [1 M]
11 Q→04questions in short. [2 marks ]
44 Q→05scientific reasons[2 marks ]
10 Q→06true or false. [1 M]
15 Q→07questions in short. [3 marks ]
28 Q→08questions in details [4 marks ]
20 Q→09questions in on sentence. [1 M]
20 Q→10case /data -based (4 Marks)
4 Q→Sample Questions
Friction questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
A body of mass $25\ kg,$ is placed on a horizontal surface whose coefficient of friction $0.25$. Find the frictional force action on it. Take $(g = 10ms^{-2})$
- A$150N$
- B$175N$
- ✓$62.5N$
- D$53.3N$
Answer: C.
View full solution →Rougher Surfaces have:
- ANo friction
- BLess friction
- ✓Higher friction
- DSame level of friction.
Answer: C.
View full solution →Why is a carrom board usually powdered before playing?
- AFor increasing friction.
- ✓For decreasing friction.
- CFor decoration.
- DFor fragrance.
Answer: B.
View full solution →In order to reduce the friction of a wheel$-$axle, a bicycle uses.
- AGears
- BBrakes
- CPedals
- ✓Ball bearings
Answer: D.
View full solution →Static Friction
Sliding Friction
Rolling Friction
Lubricants
Interlocking
Fill in the following blanks with suitable words:
Sliding friction is $............$ than the static friction.
View full solution →Sliding friction is $............$ than the static friction.
Fill in the following blanks with suitable words: Friction produces $............$
View full solution →Fill in the following blanks with suitable words: Friction always opposes $............$ between the surfaces in contact with each other.
View full solution →Fill in the following blanks with suitable words: Friction prevents our foot from $............$ over the ground.
View full solution →Fill in the following blanks with suitable words: Objects which can move quickly through the water have a $............$ shape.
View full solution →State the cause of friction between two surfaces.
Which parts wear away first in shoes? Give a reason for your answer.
A pencil eraser loses tiny pieces of rubber each time you use it. Why does this happen?
Why does a matchstick light when we strike it on a rough surface?
What is meant by lubrication ? Why is it important?
Airplanes are designed to have streamlined shape.
Drops of the oil are poured in the sewing machine after some use of it.
The tyres of the cars, trucks and bulldozers are treaded.
The attaches and other pieces of luggage are fitted with rollers.
Gymnasts apply some coarse substance on their hands.
Friction do not produce heat.
Friction can never be eliminated.
Friction can be reduced by using ball bearings in some machines.
A spring balance measures force.
Friction is independent of the nature of surfaces in contact.
Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.
- Arolling, static, sliding.
- Brolling, sliding, static.
- ✓static, sliding, rolling.
- Dsliding, static, rolling.
Answer: C.
View full solution →Explain, how can we walk so much easily on the ground.
How can a very heavy machine be moved conveniently from one place to another in a factory? (No crane is available for this purpose).
Cartilage is present in the joints of our body, which helps in their smooth movement. With advancing age, this cartilage wears off. How would this affect the movement of joints?
Give examples to show that friction is both a friend and a foe.
Explain why sliding friction is less than static friction.
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Write a short note on term 'drag'. Explain why objects moving in fluids should have streamlined shape.
What is drag? Give two examples of a drag force.
What is drag? Give two examples of a drag force.
Explain with the help of diagrams, how the use of oil reduces friction between two surfaces in contact with each other.
Explain why sliding friction is less than static friction.
Give an example to show that friction depends on the force with which the two surfaces are pressed together.
Why are cars, aeroplanes and rockets streamlined?
The picture shows four types of shoe soles.
$9.$ Which shoe sole provides the best grip and friction while walking$?$
$A.$ Sole$1$
$B.$ Sole $2$
$C.$ Sole $3$
$D.$ Sole $4$
$10.$ Why do weightlifters apply chalk powder on their palms while lifting weights$?$
View full solution →$9.$ Which shoe sole provides the best grip and friction while walking$?$
$A.$ Sole$1$
$B.$ Sole $2$
$C.$ Sole $3$
$D.$ Sole $4$
$10.$ Why do weightlifters apply chalk powder on their palms while lifting weights$?$
Anshu lets a marble roll freely on four rough wooden planks.
The table shows the time taken by the marble to reach the bottom of each plank.
$7. $ What could be the value of $X$ in the table$?$
$A. 2$ seconds
$B. 3$ seconds
$C. 4$ seconds
$D. 5$ seconds
$8.$ Anshu polished all four planks to smoothen the surfaces. She repeated her activity on the polished planks.
Will there be any change in the results? Explain your answer.
View full solution →The table shows the time taken by the marble to reach the bottom of each plank.
$7. $ What could be the value of $X$ in the table$?$
$A. 2$ seconds
$B. 3$ seconds
$C. 4$ seconds
$D. 5$ seconds
$8.$ Anshu polished all four planks to smoothen the surfaces. She repeated her activity on the polished planks.
Will there be any change in the results? Explain your answer.
The picture shows four different rubber tubes.
$5.$ Which tube will experience the least friction while rolling on a surface?
Explain your answer.
$6.$ Which of these would affect the amount of friction generated on a moving object$?$
Circle ‘Yes’ or ‘No’ for the correct response.
View full solution →$5.$ Which tube will experience the least friction while rolling on a surface?
Explain your answer.
$6.$ Which of these would affect the amount of friction generated on a moving object$?$
Circle ‘Yes’ or ‘No’ for the correct response.
| Does this Affect the Amount of Friction Generated? | Yes or No |
| Mass of the object | Yes/No |
| Surface area of the object | Yes/No |
| Roughness of the object | Yes/No |
Raju wanted to ind out which one of four surfaces produces the greatest friction.
He pushed the same toy car on the four surfaces, separately.
Raju noted the distance travelled by car on each surface before stopping.
$1.$ Choose the correct direction of force applied by Group $1$ and Group $2.$
$2.$ On which surface did the car experience the greatest friction$?$
$A.$ Surface $1$
$B.$ Surface $2$
$C.$ Surface $3$
$D.$ Surface $4$
$3.$ What must be kept the same in the activity to compare the distances travelled by the car$?$
$4.$ What will happen to the car if it continues to move on the surface for $1$ hour$?$
$A.$ The wheels will get hard.
$B$. The wheels will become hot.
$C.$ The wheels will shrink in size.
$D.$ The wheels will change shape.
View full solution →He pushed the same toy car on the four surfaces, separately.
Raju noted the distance travelled by car on each surface before stopping.
| Surface $1$ | Surface $2$ | Surface $3$ | Surface $4$ | |
| Distance travelled by the toy car before stopping | $120\ cm$ | $150\ cm$ | $100\ cm$ | $180 \ cm$ |
$2.$ On which surface did the car experience the greatest friction$?$
$A.$ Surface $1$
$B.$ Surface $2$
$C.$ Surface $3$
$D.$ Surface $4$
$3.$ What must be kept the same in the activity to compare the distances travelled by the car$?$
$4.$ What will happen to the car if it continues to move on the surface for $1$ hour$?$
$A.$ The wheels will get hard.
$B$. The wheels will become hot.
$C.$ The wheels will shrink in size.
$D.$ The wheels will change shape.
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