Question

3. The streamlined shape of birds reduces (a) weight (c) friction (b) power (d) speed 4. Friction is a (a) contact force (d) magnetic force 5. Friction force exerted by fluids is called (b) noncontact for (d) all of these​

Answer 1

Answer:

1. The streamlined shape of birds reduces friction.
2. Friction is a contact force.
3. Friction force exerted by fluids is called viscous friction.

Explanation:

Hint: The frictional force which liquids exert is called viscous friction. It is the tension between the fluid and the boundaries in motion that allows the fluid to shave. The force required for that action is a measure of the viscosity of the fluid.

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Answer 2

Explanation:

3. (c) - friction .

4 . (a) - contact force .

5. (a) - force of friction .