state whether following is true or false.
1) Friction is a contact force.
2. Friction is greater when there are fewer irregularities on a surface.
3. Friction is greater when an object is stationary on a surface than when it is moving over it.
4. Rolling friction is less than static friction.
5. Energy is wasted in overcoming friction
6. It is desirable to increase friction in the brakes of vehicles.
7. Streamlining a shape reduces drag due to air or water.
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1
Answer:
1.true
2.dont know
3 false
4.true
5.false
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