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Force and Laws of Motion — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceForce and Laws of Motion1 Mark
MCQ
In the following Questions, the Assertion and Reason have be put forward. Read the statements careful and choose the correct alternative from the following:
Assertion: We should always wear a seat belt while travelling in a car.
Reason: Seat belt prevents us from falling forward due to inertia when sudden breakes are applied.
  • ✓
    Both the Assertion and the Reason a correct and the Reason is the correct explanation of the Assertion.
  • B
    The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
  • C
    Assertion is true but the Reason is false.
  • D
    The statement of the Assertion is false but the Reason is true.
✓

Answer

Correct option: A.
Both the Assertion and the Reason a correct and the Reason is the correct explanation of the Assertion.
Inertia is the reason that people in cars need to wear seat belts. A moving car has inertia, and so do the riders inside it. When the driver applies the brakes, an unbalanced force is applied to the car. Normally, the bottom of the seat applies an unbalanced force-friction-which slows the riders down as the car slows. If the driver stops the car suddenly, however, this force is not exerted over enough time to stop the motion of the riders. Instead, the riders continue moving forward with most of their original speed because of their inertia.

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