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UPSC 2008: A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?
(a)It will be greater than R
(b)It will be less than R
(c)It will be equal to R
(d)It shall depend on the material of the road
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Not attemptedCorrect Answer: (c) It will be equal to R
When the car moves on a straight, level road at constant speed, its acceleration is zero; hence the normal reaction on each wheel depends only on weight (mg) and remains the same as when the car is at rest, i.e. equal to R. Any change in reaction requires longitudinal acceleration (ma). ([physics.stackexchange.com](https://physics.stackexchange.com/questions/613158/normal-reaction-force?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2008 Science & Technology question?▼
The correct answer is option (c): It will be equal to R. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2008, GS Paper 1, as Question 127. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.