Question 1

A 20 N object is falling through the air and encounters 5 N of air resistance. What is the net force acting on the object?

Accepted Answer

$$15\ \mathrm{N}$$

Question 2

Which equation correctly expresses Newton's Second Law for a falling object experiencing air resistance?

Accepted Answer

$$F_{	ext{net}} = m a$$

Question 3

If a falling object has a weight of $$20\ \mathrm{N}$$ and experiences $$5\ \mathrm{N} of $$air resistance, what is its acceleration? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$7.5\ \mathrm{m/s^2$}$$

Question 4

What is the mass of an object with a weight of $$20\ \mathrm{N}$$? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.04\ \mathrm{kg}$$

Question 5

Which of the following best describes terminal velocity?

Accepted Answer

The constant speed reached when the force of gravity equals the force of air resistance.

Question 6

A skydiver jumps from a plane and eventually reaches terminal velocity. What is true about the forces acting on the skydiver at terminal velocity?

Accepted Answer

The force of gravity is equal to the force of air resistance.

Question 7

If the air resistance acting on a falling object increases, what happens to its acceleration?

Accepted Answer

The acceleration decreases.

Question 8

Which formula is used to calculate the weight of an object?

Accepted Answer

$$W = m g$$

Question 9

A falling object with a mass of $$2\ \mathrm{kg}$$ experiences a net force of $$7.5\ \mathrm{N}. $$What is its acceleration?

Accepted Answer

$$3.75\ \mathrm{m/s^2$}$$

Question 10

Which statement is true about the acceleration of a freely falling object in the absence of air resistance?

Accepted Answer

It is always equal to $$g.$$

Question 11

A $$5\ \mathrm{kg}$$ object falls through the air and reaches a constant speed. What is the magnitude of the air resistance acting on it at this speed?

Accepted Answer

$$49\ \mathrm{N}$$

Question 12

If a falling object is acted upon by a constant force of $$5\ \mathrm{N}$$, what is its acceleration if its mass is $$0.5\ \mathrm{kg}$$?

Accepted Answer

$$10\ \mathrm{m/s^2$}$$

Question 13

Which of the following is a correct statement about the net force on a falling object with air resistance?

Accepted Answer

Net force equals weight minus air resistance.

Question 14

A $$2\ \mathrm{kg}$$ object falls and experiences $$10\ \mathrm{N} of $$air resistance. What is the net force acting on the object? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$9.6\ \mathrm{N}$$

Question 15

Which of the following best explains why a feather and a coin fall at different rates in Earth's atmosphere?

Accepted Answer

Air resistance affects the feather more than the coin.

Question 16

A $$10\ \mathrm{kg}$$ object falls and encounters $$20\ \mathrm{N} of $$air resistance. What is its acceleration? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$7.8\ \mathrm{m/s^2$}$$

Question 17

Which of the following is true about the acceleration of a falling object as it approaches terminal velocity?

Accepted Answer

The acceleration decreases and approaches zero.

Question 18

A $$3\ \mathrm{kg}$$ object falls and experiences $$10\ \mathrm{N} of $$air resistance. What is its acceleration? (Use $$g = 10\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.33\ \mathrm{m/s^2$}$$

Question 19

Which real-world scenario best illustrates the concept of terminal velocity?

Accepted Answer

A skydiver falling at a constant speed after opening their parachute.

Newton's Second Law and Air Resistance: Falling Objects

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