Understanding Terminal Velocity

The video tutorial explains terminal velocity, focusing on the forces acting on a falling object, such as weight and air resistance. It describes how air resistance increases with speed until it balances the weight force, resulting in zero net force and constant velocity, known as terminal speed. The tutorial covers equations for calculating terminal velocity at low and high speeds, considering factors like mass, fluid density, and projected area. A practice problem involving a skydiver is used to apply these concepts, demonstrating how to calculate acceleration and air resistance at different speeds.

What happens to an object's speed as it falls and encounters air resistance?

• It fluctuates randomly.

• It decreases steadily.

• It remains constant.

• It increases until air resistance balances the weight force.

When does an object reach its terminal velocity?

• When the object reaches the ground.

• When air resistance is greater than the weight force.

• When the net force is zero and acceleration stops.

• When the object stops moving.

How is terminal velocity calculated at low speeds?

• By dividing the weight force by the square of the velocity.

• By multiplying the weight force by the velocity.

• By dividing the weight force by a proportionality constant.

• By adding the weight force and air resistance.

What is the effect of increasing the projected area of a falling object?

• It increases the terminal velocity.

• It decreases the terminal velocity.

• It doubles the terminal velocity.

• It has no effect on terminal velocity.

Which factor does NOT affect the proportionality constant 'd'?

• Mass of the object

• Projected area of the object

• Drag coefficient

• Density of the fluid

In the practice problem, what is the acceleration of the skydiver at 40 m/s?

• 0 m/s²

• 9.8 m/s²

• -4.616 m/s²

• 4.616 m/s²

How does adding a backpack affect the skydiver's terminal velocity?

• It significantly decreases the terminal velocity.

• It has no effect on the terminal velocity.

• It significantly increases the terminal velocity.

• It slightly increases the terminal velocity.

What is the new terminal speed of the skydiver with a 15 kg backpack?

• 60.25 m/s

• 50 m/s

• 55 m/s

• 65 m/s

What is the force of air resistance on the diver at 35 m/s?

• 297.65 N

• 350 N

• 250 N

• 400 N

Which of the following can increase the terminal velocity of a falling object?

• Increasing the projected area

• Decreasing the projected area

• Decreasing the mass

• Increasing the mass