Q: Which equation correctly expresses Newton's Second Law of Motion?

$$a = \frac{F_{\text{net}}}{m}$$

Question 1

Which of the following best describes the relationship between mass and inertia?

Accepted Answer

Inertia is a property of matter that depends on the amount of mass.

Question 2

A skydiver jumps from a plane and accelerates until reaching terminal velocity. Which statement best explains why the skydiver stops accelerating?

Accepted Answer

The upward air resistance equals the downward weight, resulting in zero net force.

Question 3

Which equation correctly expresses Newton's Second Law of Motion?

Accepted Answer

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

Question 4

A 10-kg object is acted upon by a net force of 50 N. What is its acceleration?

Accepted Answer

$$a = 5\ 	ext{m/s}^2$$

Question 5

Which of the following is NOT a scientific hypothesis?

Accepted Answer

Undetectable particles are some of nature's secrets.

Question 6

A car travels 200 km in 4 hours. What is its average speed?

Accepted Answer

$$50\ 	ext{km/h}$$

Question 7

If you stand with one foot on each of two bathroom scales and your weight is evenly distributed, what will each scale read?

Accepted Answer

Half your weight.

Question 8

A 5-kg iron ball and a 10-kg iron ball are dropped from rest in a vacuum. When the 5-kg ball reaches a speed of 10 m/s, what is the speed of the 10-kg ball?

Accepted Answer

10 m/s.

Question 9

Which of the following is a vector quantity?

Accepted Answer

Velocity.

Question 10

A cart is pulled to the right with a force of 15 N and to the left with a force of 20 N. What is the net force and its direction?

Accepted Answer

5 N to the left.

Question 11

Which statement best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter; weight is the force due to gravity.

Question 12

A bowling ball is in equilibrium when it

Accepted Answer

Both of the above.

Question 13

A skydiver with a weight of 600 N falls at terminal velocity. What is the magnitude of the air resistance?

Accepted Answer

600 N.

Question 14

Which equation gives the distance fallen from rest under constant acceleration $$g$$ after time $$t$$?

Accepted Answer

$$d = \frac{1}{2} g t^2$

Question 15

A 20-N falling object encounters 5 N of air resistance. What is its acceleration?

Accepted Answer

$$a = \frac{15\ 	ext{N}}{m}$$

Question 16

Which of the following best illustrates the scientific attitude?

Accepted Answer

Willingness to admit error and change one's mind based on evidence.

Question 17

If the net force on a cart is doubled and its mass is also doubled, what happens to its acceleration?

Accepted Answer

It remains the same.

Question 18

Which of the following is a real-world example of dynamic equilibrium?

Accepted Answer

A hockey puck sliding at constant speed on ice.

Question 19

A heavy and a light person jump from the same altitude with identical parachutes. Who reaches the ground first and why?

Accepted Answer

The heavy person, because they have a greater terminal velocity.

Question 20

Which equation correctly expresses the velocity of a freely falling object starting from rest after time $$t$$?

Accepted Answer

$$v = g t$$

Foundations of Physics: Scientific Method, Motion, and Newton's Laws

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