WorksheetsUpthrust and Stoke's Law
Total questions: 14
Worksheet time: 40mins
A ball of volume Vb and density pb is released in a volume Vl of liquid with density pl. The upthrust on the ball is given by
Vb pb g
Vb pl g
Vl pb g
Vl pl g
Q and R are drops of two different fluids which have been placed on one end of the tile which is tilted. The drops spread down the tile. Which could be a correct explanation for the different lengths shown?
R has a greater viscosity than Q
R has a greater density than !
R has a greater temperature than Q
All of the above
In the expression...
F=6πηrvη represents density and ν represents viscosity
r represents radius and η represents density
r represents radius and ν represents viscosity
η represents viscosity and ν represents velocity
What is meant by the term viscosity?
(a)
A small metal ball is dropped into a cylinder of oil. The time taken for the ball to fall to the bottom is recorded. Which changes to the ball would result in the greatest decrease in the time taken to reach the bottom?
Smaller mass and smaller diameter
Smaller mass and greater diameter
Greater mass and smaller diameter
Greater mass and greater diameter
A ball bearing is dropped through a liquid and its terminal velocity measure. The experiment is repeated at a different temperature. Which answer correctly describes this second experiment?
Lower temperature: greater viscosity and faster velocity
Lower temperature: greater viscosity and slower velocity
Higher temperature: greater viscosity and slower velocity
Higher temperature: smaller viscosity and slower velocity
The table shows the diameters of different particles in soil. If soil is added to water, which particles will settle on the bottom first (assuming all particles are the same density)?
Clay
Silt
Sand
Fine Pebbles
Coarse Pebbles
Explain why the coarse pebbles hit the bottom first.
As a balloon rises through the air, the density of the surrounding air decreases. Why does this limit the height the balloon can reach?
The surface of a golf ball is covered in small dimples. These dimples enable the ball to travel a greater distance. Which of the statements is true?
The dimples result in only turbulent flow
The dimples result in only laminar flow
The dimples reduce drag
The dimples increase drag
A ball bearing is released in a cylinder filled with oil. Which of the following would have to increase to increase the time taken for the ball bearing to reach the bottom?
The temperature of the oil
The viscosity of the oil
The gravitational field strength
The density of the ball bearing
The flow of water in a pipe is turbulent. Which statement correctly describes turbulent flow?
Speed and direction at a point remain constant
The layers are parallel
The layers do not mix
There are sudden changes in speed and directiom
A small bubble is rising through a liquid at a constant speed. Which row correctly summarises the forces acting upon the bubble?
A table tennis ball is released beneath the surface of water and moves upwards. The relationship between the forces acting on the ball when it reaches terminal velocity is...
weight = upthrust
weight + drag = upthrust
weight = upthrust + drag
weight = drag
