Worksheetsviscosity 1
Total questions: 35
Worksheet time: 29mins
Viscosity can be described as...
a physical property of liquids
a physical property of solids
a chemical property of liquids
What is fluid flow?
Describes how fluids behave when frozen.
Describes how fluids behave when heated.
Describes how fluids behave in their surrounding environment.
Which of these are fluids?
Sand and water
Water and Oxygen
Oxygen and Rocks
Rocks and Sand
What is Viscosity?
A fluids colour.
A fluids temperature.
A fluids resistance to flow.
Which of these factors affects Viscosity?
Temperature
Colour
Taste
Liquids with very low viscosity ,flow very _______________________.
fast
not at all
slow
whenever it wants
As temperature increases ,viscosity of liquid _______________.
increases
stays the same
decreases
How is viscosity & density affected when a fluid is heated?
viscosity increases & density increases
viscosity decreases & density decreases
viscosity decreases & density increases
temperature has no affect on viscosity or density
As the temperature increases the viscosity _______________, the molecules move further apart making the liquid "thinner".
increases
stays the same
decreases
Fluids with very high viscosity flow very _______________________.
fast
not at all
slow
whenever it wants
Which of these are classified as fluids?
Solid
Liquid
Gas
What is flow rate?
The speed of a fish swimming across a lake.
The speed of a rocket going to the moon.
The speed which a fluid flows from one point to another.
What is the SI unit of viscosity?
Pascal (Pa)
Poiseiulle (PI)
Newton/m2
Newton
What is the formula for viscosity?
Flow rate may be determined by the following equation:
Flow Rate = time/volume, measured in s/ml
Flow Rate = volume/ time, measured in ml/s
Flow rate = volume X time
Flow rate = time X volume
What is viscosity?
A measurement of a fluid's resistance to flow or change in shape
The force required to maintain a unit velocity gradient between two parallel layers of liquid
The difference in velocity between the fluid's adjacent layers
The ratio of shearing stress to the velocity gradient of the fluid
What is the measurement of a fluid's resistance to flow or change in shape at a given rate?
Viscous gradient
Coefficient of viscosity
Deformation rate
Viscosity
What role does the coefficient of viscosity play in various applications?
Determining the difference in velocity between the fluid's adjacent layers
Measuring the force required to maintain a unit velocity gradient between two parallel layers of liquid
Determining how easily or difficult a fluid flows under the effect of external forces
The correct statement about the viscosity of gases
changes with temperature but is practically unaffected by pressure
practically unaffected by temperature but very much affected by pressure
affected considerably temperature and pressure
unaffected by temperature and pressure
What is drag?
The force that acts parallel to the interface of two surfaces that are in contact, and opposes their relative motion
The force or forces acting to oppose the motion of an object through a fluid medium
The inverse relationship between airflow velocity and air pressure
The force or forces acting to promote the motion of an object through a fluid medium
What is the Formula for Stokes' Law
F = 6πη/rv
F = 4/3 πηrv
F = 6πηrv
F = 6πηr^2v^2
What condition must be met for terminal velocity to be reached ?
Weight = Upthrust / Drag
Weight = Upthrust x Drag
Weight = Upthrust - Drag
Weight = Upthrust + Drag
When the air resistance or drag is equal and opposite to the weight of the object you would call this
terminal velocity
gravitational weight
flux capacitor
rotational inertia
Stokes law can be used to calculate:
The turbulence caused by fluids that slow down an object
The laminar flow
Drag force on the a sphere moving constant speed in a viscous fluid
The terminal velocity of an object in freefall that is going at constant speed when the gravitational force equals the upward air resistance
A student measured the terminal velocity of different objects as they fell through a liquid. The student used the measurements and Stokes' Law to calculate the viscosity of the liquid.
For which of the following conditions does Stokes' Law apply?
spherical objects and laminar flow
spherical objects and low viscosity
cylindrical objects and laminar flow
cylindrical objects and low viscosity
A sample of sea water is collected using a beaker. The sample contains some particles of
sand which settle at the bottom of the beaker.
Which of the following would result in a decrease in the time taken for the sand to settle?
smaller particles of sand
lower temperature of the sea water
smaller terminal velocity of sand particles
lower viscosity of the sea water
Which of the following best describes the situations in which Stokes' Law applies for objects moving in a fluid?
all spherical objects moving at low speeds
all spherical objects in a fluid with low viscosity
small spherical objects moving at low speeds
small spherical objects in a fluid with low viscosity
Stokes' law can be used to determine the frictional force on an object moving through a fluid.
To which of the following would Stokes' law best apply?
A large sphere moving quickly through a fluid.
A large sphere moving slowly through a fluid.
A small sphere moving quickly through a fluid.
A small sphere moving slowly through a fluid.
A ball bearing falls at terminal velocity through a liquid.
The temperature of the liquid increases and the ball bearing falls with a greater terminal velocity.
Which row of the table is correct as the temperature of the liquid increases?
FD constant, η increase
FD constant, η decrease
FD decrease, η increase
FD decrease, η decrease
Two spheres, A and B, fall through the same viscous fluid. A and B have the same density; A has the larger radius. Which has the larger terminal velocity?
A has the larger terminal velocity.
B has the larger terminal velocity.
A and B have the same terminal velocity.
As raindrops fall they reach a terminal velocity.
Which of the following properties has a negligible effect on the terminal velocity of a raindrop?
density of water
viscosity of water
viscosity of air
volume of raindrop
What happens to the drag force on spheres with increasing mass?
The drag force is constant
The drag force is increase
The drag force is decrease
What happens to the drag force on spheres with increasing radius size?
The drag force is constant across all sizes of spheres in a fluid.
The drag force increases with the size of the sphere falling through a fluid.
The drag force decreases with the size of the sphere falling through a fluid.
A small metal sphere is dropped through honey and another identical sphere is dropped into a less viscous oil. Which statement is TRUE?
The terminal velocities of the sphere in both fluids are the same.
The terminal velocity in the honey is greater than the terminal velocity in the oil.
The terminal velocity in the oil is greater than the terminal velocity in the honey.
