Demonstrating and Solving for Drag Coefficient

The video tutorial explains the concept of terminal velocity and the drag coefficient of a steel sphere moving through water. It begins with a free body diagram to illustrate the forces acting on the sphere and derives the equation for the drag coefficient. The tutorial then calculates the terminal speed and initial drag coefficient, correcting it by using the correct density of water. The importance of buoyancy force is highlighted, showing its significant impact on the drag coefficient. Finally, the video compares the buoyancy effects in water and air, emphasizing the differences due to media density.

What is the relationship between the forces acting on a steel sphere at terminal velocity?

• The force of drag is greater than the force of gravity.

• The force of drag is less than the force of gravity.

• The force of drag is equal to the force of gravity.

• The force of drag is unrelated to the force of gravity.

Which variable was incorrectly used in the initial calculation of the drag coefficient?

• Density of the medium

• Radius of the sphere

• Mass of the sphere

• Density of the sphere

What is the correct density to use in the drag force equation for an object moving through water?

• Density of water

• Density of air

• Density of the object

• Density of steel

Why is the buoyancy force significant for the steel sphere in water?

• Because the sphere is lighter in air

• Because water has a lower density than air

• Because water has a higher density than air

• Because the sphere is heavier in water

How does the inclusion of buoyancy affect the calculated drag coefficient?

• It increases the drag coefficient significantly.

• It decreases the drag coefficient significantly.

• It slightly adjusts the drag coefficient.

• It has no effect on the drag coefficient.

What is the primary reason the buoyancy force is negligible for objects in air?

• Air has a higher density than water.

• Air has a lower density than water.

• Objects are heavier in air.

• Objects are lighter in water.

How much larger is the buoyancy force in water compared to air?

• About 10 times larger

• About 100 times larger

• About 800 times larger

• About 1000 times larger