case /data -based (4 Marks)

Question 14 Marks

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$?$

Answer

$9. B.$ Sole $2$
$10.$ Mentions that chalk powder increases the friction between the palms and the weights or chalk powder provides better grip.
For example:
● Chalk powder increases the friction between the palms and the weights.
OR
● Chalk powder provides better grip.

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Question 24 Marks

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.

Answer

$7. D. 5$ seconds
$8.$ Mentions that the marble will take less time to reach the bottom of each plank as the friction is decreased. For example:
● The marble will reach the bottom of each plank in less time. The amount of friction on each plank is decreased.

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Question 34 Marks

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.

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

Answer

$5.$ Mentions that Tube $2$ will experience the least amount of rolling friction as it has the smallest amount of surface area touching the surface at any point of time.
For example:
● Tube $2,$ as it has the smallest amount of surface area touching the surface at any given time.
$6.$ No
Yes
Yes

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Question 44 Marks

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.

	Surface $1$	Surface $2$	Surface $3$	Surface $4$
Distance travelled by the toy car before stopping	$120\ cm$	$150\ cm$	$100\ cm$	$180 \ cm$

$1.$ 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.

Answer

$1. B.$ Image
$2. C.$ Surface $3$
$3.$ Mentions that the amount of push force on the toy car should be the same for the four surfaces.
For example:
● The amount of push force on the toy car for each surface.
$4. B.$ The wheels will become hot

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Science case /data -based (4 Marks)

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