Question 1

Which of the following best describes Newton's First Law of Motion?

Accepted Answer

An object will remain at rest or in uniform motion in a straight line unless acted upon by a net external force.

Question 2

A hockey puck slides on ice with constant velocity. According to Newton's First Law, what can you conclude about the net force acting on the puck?

Accepted Answer

The net force on the puck is zero.

Question 3

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

Accepted Answer

$$F = ma$$

Question 4

A 2 kg object is acted on by a net force of 10 N. What is its acceleration?

Accepted Answer

$$5\ \mathrm{m/s^2$}$$

Question 5

If the net force on an object is zero, which of the following must be true?

Accepted Answer

The object moves with constant velocity or remains at rest.

Question 6

A car of mass 1000 kg accelerates from rest to $$20\ \mathrm{m/s} in 10 $$seconds. What is the average net force acting on the car?

Accepted Answer

$$2000\ \mathrm{N}$$

Question 7

Which of the following statements about force vectors is correct?

Accepted Answer

Forces are vectors and must be added using vector addition.

Question 8

A 5 kg box is pulled to the right with a force of 30 N and to the left with a force of 10 N. What is the acceleration of the box?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$\ to\ the\ right

Question 9

Which of the following best describes inertia?

Accepted Answer

The tendency of an object to resist changes in its state of motion.

Question 10

A 10 kg object is at rest. A net force of 50 N is applied for 2 seconds. What is the final velocity of the object?

Accepted Answer

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

Question 11

Which of the following is a correct statement of Newton's Second Law in terms of the sum of forces?

Accepted Answer

$$\sum F = ma$$

Question 12

A 3 kg object is moving at $$4\ \mathrm{m/s}. If a $$net force of 6 N acts in the direction of motion, what will its velocity be after 2 seconds?

Accepted Answer

$$8\ \mathrm{m/s}$$

Question 13

Which of the following real-life scenarios best illustrates Newton's First Law?

Accepted Answer

A passenger in a car moves forward when the car suddenly stops.

Question 14

If two forces, $$F_1 = 8$$\ \mathrm{N}$$ to the right and F_2$ = 5\ \mathrm{N} to $$the left, act on a 1.5 kg object, what is the acceleration?

Accepted Answer

$$2\ \mathrm{m/s^2$}$$\ to\ the\ right

Question 15

Which of the following is NOT a correct implication of Newton's First Law?

Accepted Answer

An object will accelerate if no forces act on it.

Question 16

A 4 kg object is subject to two forces: 12 N east and 8 N west. What is the acceleration and its direction?

Accepted Answer

$$1\ \mathrm{m/s^2$}$$\ east

Question 17

Which of the following best explains why seatbelts are important in cars, according to Newton's Laws?

Accepted Answer

They provide the unbalanced force needed to stop your body when the car stops suddenly.

Question 18

A net force of 15 N acts on a 3 kg object for 4 seconds. What is the change in velocity?

Accepted Answer

$$20\ \mathrm{m/s}$$

Question 19

Which of the following is the correct vector equation for the sum of forces?

Accepted Answer

$$\sum \vec{F} = m \vec{a}$$

Question 20

A 6 kg object is initially at rest. If a constant net force of 18 N acts on it, how far does it travel in 4 seconds?

Accepted Answer

$$24\ \mathrm{m}$$

Newton's Laws of Motion and Forces (Ch 5.1 & 5.2) - Study Notes

스터디 가이드 - 연습 문제