Physics
Grade-9
Easy
Question
Statement I: We can live very happily if friction is not present in nature.
Statement II: Airplane shape is streamlined to reduce frictional force.
- Both statements I and II are true, statement II is correct explanation for statement I.
- Both statements I and II are true, statement II is not the correct explanation for statement I.
- Statement I is true, and statement II is false.
- Statement I is false, and statement II is true.
Hint:
Without friction, daily activities cannot be made easy and possible. While airplanes are streamlined to minimize fluid friction , writing, holding etc needs frictional force to get our job done.
Thus, friction is necessary evil.
The correct answer is: Statement I is false, and statement II is true.
Statement I is false, and statement II is true.
- Friction is necessary for all the activities in day-to-day life.
- There exists certain circumstances where it is required to minimize or maximize friction in real life activities.
- The airplanes are streamlined to reduce the effect of frictional force.
- Activities such as walking, holding, jumping etc. needs friction.
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