Factors Affecting Fluid Friction

Q. Frictional force on an object in a fluid depends on

1. its speed with respect to fluid
2. the shape of the object
3. the mass of the object
4. the nature of the fluid

Q. What is surface tension?

Q.

How can you reduce the drag on something moving on:

(a) air

(b)water

Q. If we change the shape of a free falling object, then the air drag on the object will change.

1. True
2. False

Q. A space shuttle while descending rapidly to the surface of earth from a mission gets heated up intensely and catches fire. Assuming no malfunctioning of its engine or components, what can be a possible cause?

1. Velocity of the shuttle is too low.
2. Earth's atmosphere offers frictional force.
3. Parachutes are attached.
4. Gravitational pull of the Sun is too strong on the shuttle.

Q. Friction can be eliminated by using large amount of lubricants between the surfaces in contact.

1. True
2. False

Q. If all other factors remain the same, arrange these media in the increasing order of the frictional force offered by them.

1. Vacuum
2. Air
3. Water
4. Honey

Q.

If we change the shape of a freely falling object, then air drag on the object will change.

Q.

Where does the principal of drag aplies?

Q. If all other factors remain same, arrange these media in increasing order of frictional force offered by them.

1. Vacuum
2. Air
3. Water
4. Honey

Q. If all other factors remain same, arrange these media in increasing order of frictional force offered by them.

1. Vacuum
2. Air
3. Water
4. Honey

Q. Frictional force on an object in a fluid depends on
(i) shape of the object
(ii) mass of the object
Choose the correct one.

1. Only (i) is correct
2. Only (ii) is correct
3. Both (i) and (ii) are correct
4. None of (i) and (ii) are correct

Q. What should a cat do to save itself from getting hurt when falling from a height?

1. It should make its surface smoother by using atmospheric gradient
2. None of the above
3. It should increase its air drag
4. It should decrease its body weight

Q. If we change the shape of a freely falling object, then
air drag on the object will change.

Q. Frictional force on a moving object in a fluid depends on :
(i) Shape of the object
(ii) Mass of the object
Choose the correct one.

1. Both (i) and (ii) are incorrect
2. Both (i) and (ii) are correct
3. Only (i) is correct
4. Only (ii) is correct

Q. If all other factors remain same, arrange these media in increasing order of frictional force offered by them.

1. Vacuum
2. Air
3. Water
4. Honey

Q. Air drag can be reduced by designing vehicles having streamlined shapes.

1. True
2. False

Q. Which of the following factors affect the fluid friction?

1. Nature of the fluid
2. Shape of the object
3. Speed of the object
4. All of the above

Q. Air drag decreases with an increase in surface area of an object.

1. True
2. False

Q. If all other factors remain same, arrange these media in increasing order of frictional force offered by them.

1. Vacuum
2. Air
3. Water
4. Honey

Q. Air drag can be reduced by designing vehicles having streamlined shapes.

1. True
2. False