Question 1

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

Accepted Answer

An object at rest will remain at rest, and an object in motion will continue moving in a straight line with constant velocity, if and only if the net force acting on it is zero.

Question 2

A box of mass $$m is $$pulled across a frictionless surface by a constant force $$F. $$What is the acceleration of the box?

Accepted Answer

$$a = \frac{F}{m}$$

Question 3

A person lowers a heavy object at constant speed using a rope. What is the relationship between the tension in the rope ($$T) $$and the weight of the object ($$W$$)?

Accepted Answer

$$T = W$$

Question 4

Which force is responsible for keeping a book stationary on a tilted desk?

Accepted Answer

Static friction

Question 5

A ball is shot horizontally out of a tube and leaves the tube. Ignoring air resistance, which path will the ball follow?

Accepted Answer

It will follow a straight line tangent to the exit point, then curve downward due to gravity.

Question 6

A skier is pulled up a slope at constant speed. Which statement is true about the net force acting on the skier?

Accepted Answer

The net force is zero.

Question 7

Which of the following is NOT a contact force?

Accepted Answer

Gravitational force

Question 8

A car suddenly stops and a passenger feels thrown forward. Which concept explains why the passenger moves forward?

Accepted Answer

Law of inertia (Newton's First Law)

Question 9

If a constant force causes an object to accelerate at $$4\ \mathrm{m/s^2$}$$, what will be the acceleration if the mass of the object is doubled and the same force is applied?

Accepted Answer

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

Question 10

Which of the following best describes the direction of the kinetic friction force acting on a sliding object?

Accepted Answer

Opposite to the direction of the object's velocity and tangent to the surface

Question 11

A rocket is launched vertically upward. Which forces act on the rocket during launch (neglecting air resistance)?

Accepted Answer

Thrust force upward and gravitational force downward

Question 12

Which statement about inertial reference frames is correct?

Accepted Answer

A car moving at constant velocity is an inertial reference frame.

Question 13

A block is pulled to the right with a constant, steady force on a frictionless surface. What does its acceleration vs. time graph look like?

Accepted Answer

Acceleration is constant over time.

Question 14

Which of the following is the correct formula for Newton's Second Law?

Accepted Answer

$$F_{net} = m \cdot a$$

Question 15

A block of mass $$2\ \mathrm{kg} is $$acted upon by two forces: $$5\ \mathrm{N} to $$the right and $$3\ \mathrm{N} to $$the left. What is the acceleration of the block?

Accepted Answer

$$a = 1\ \mathrm{m/s^2$}$$

Question 16

Which force is responsible for the upward push on a book resting on a table?

Accepted Answer

Normal force

Question 17

A block is pulled by three rubber bands, each stretched to the same length. If the acceleration with one band is $$a$$, what is the acceleration with three bands?

Accepted Answer

$$3a$$

Question 18

Which of the following best describes the agent of the gravitational force acting on an object near Earth's surface?

Accepted Answer

The entire planet

Question 19

A block is lowered by a rope at a steadily decreasing speed. What is true about the tension in the rope compared to the block's weight?

Accepted Answer

Tension is greater than the block's weight.

Question 20

Which of the following is a resistive force experienced by objects moving through fluids?

Accepted Answer

Drag force

Chapter 5: Force and Motion – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드