John carried out an experiment to find out how different road surfaces -P- Q- R and S- affect the stopping distance of a car travelling at 50 km-h- The result is tabulated below- - Type of road surface amp-P amp-Q amp-R amp-S- Stopping distance -m- amp-18 amp-15 amp-19 amp-27- - Which surface provides maximum frictional force-QRSP

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Standard VIII

Physics

Effect of Nature of Surface on Friction

John carried ...

Question

John carried out an experiment to find out how different road surfaces (P, Q, R and S) affect the stopping distance of a car travelling at 50 km/h. The result is tabulated below.

$\begin{matrix} Type of road surface & P & Q & R & S Stopping distance (m) & 18 & 15 & 19 & 27 \end{matrix}$

Which surface provides maximum frictional force?

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Solution

The correct option is B Q
As we can see from the table, stopping distance is minimum for surface Q. More the frictional force, more will be the opposition to motion and lesser will be the stopping distance. Hence, surface Q provides maximum frictional force.

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Q. John carried out an experiment to find out how different road surfaces (P, Q, R and S) affect the stopping distance of a car travelling at 50 km/h. The result is tabulated below.

\begin{matrix} Type of road surface & P & Q & R & S Stopping distance (m) & 18 & 15 & 19 & 27 \end{matrix}

Which surface provides maximum frictional force?

Q. John carried out an experiment to find out how different road surfaces (P, Q, R and S) affect the stopping distance of a car travelling at 50 km/h. The result is tabulated below.

\begin{matrix} Type of road surface & P & Q & R & S Stopping distance (m) & 18 & 15 & 19 & 27 \end{matrix}

Which surface provides maximum frictional force?

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$\begin{matrix} T y p e o f r o a d s u r f a c e s & P & Q & R & S S t o p p i n g d i s t a n c e & 18 & 15 & 19 & 27 \end{matrix}$
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$\begin{matrix} Type of road surfaces & P & Q & R & S Stopping distance & 18 m & 15 m & 19 m & 27 m \end{matrix}$
Which type of road will provide the greatest frictional force for the car to stop?

Q. Harry carried out an experiment to find out how different surfaces (A, B, C and D) affect the distance of a car travelling at 50 km/h needed to stop once the brakes applied. The results are shown below in given table. Which type of road will provide the most friction for the car to stop?

हैरी यह ज्ञात करने के लिए एक प्रयोग करता है, कि भिन्न-भिन्न पृष्ठ (A, B, C तथा D) 50 km/h से गतिशील एक कार को ब्रेक लगाकर रोकने के लिए आवश्यक दूरी को किस प्रकार प्रभावित करते हैं। परिणाम नीचे दी गई सारणी में दर्शाए गए हैं तथा किस प्रकार की सड़क कार के रूकने के लिए सर्वाधिक घर्षण प्रदान करेगी?

Types of road surface (सड़क के पृष्ठ के प्रकार)	Stopping distance (m) (रूकने की दूरी (m))
A	18
B	25
C	19
D	17

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John carried out an experiment to find out how different road surfaces (P, Q, R and S) affect the stopping distance of a car travelling at 50 km/h. The result is tabulated below. Type of road surfacePQRSStopping distance (m)18151927 Which surface provides maximum frictional force?

The correct option is B QAs we can see from the table, stopping distance is minimum for surface Q. More the frictional force, more will be the opposition to motion and lesser will be the stopping distance. Hence, surface Q provides maximum frictional force.

The correct option is B Q
As we can see from the table, stopping distance is minimum for surface Q. More the frictional force, more will be the opposition to motion and lesser will be the stopping distance. Hence, surface Q provides maximum frictional force.