Q: Which of the following is a correct method for converting 2.00 feet to meters, given $$1\ \mathrm{ft} = 0.3048\ \mathrm{m}$$?

$$2.00\ \mathrm{ft} \times \frac{0.3048\ \mathrm{m}}{1\ \mathrm{ft}}$$

Question 1

Which of the following best describes the particle model in physics?

Accepted Answer

An object is represented as if all its mass were concentrated at a single point.

Question 2

A car accelerates from rest up a hill. Which of the following statements about its motion diagram is correct?

Accepted Answer

The velocity vectors increase in length as the car moves up the hill.

Question 3

Which equation correctly defines average velocity $$\vec{v}_{avg}$$ for a displacement $$\Delta \vec{x}$$ over a time interval $$\Delta t$$?

Accepted Answer

$$\vec{v}_{avg} = \frac{\Delta \vec{x}}{\Delta t}$$

Question 4

A skier moves at constant speed on a horizontal surface, then speeds up down a hill. Which statement about the acceleration vectors is correct?

Accepted Answer

The acceleration vectors are zero on the horizontal, and point down the hill as the skier speeds up.

Question 5

Which of the following is the correct SI unit for mass?

Accepted Answer

kilogram (kg)

Question 6

If a car travels 100 meters in 5 seconds, what is its average speed?

Accepted Answer

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

Question 7

Which of the following statements about acceleration is correct?

Accepted Answer

Acceleration is the rate of change of velocity.

Question 8

A motion diagram shows dots getting closer together as time progresses. What does this indicate about the object's motion?

Accepted Answer

The object is slowing down.

Question 9

Which of the following is a correct method for converting 2.00 feet to meters, given $$1\ \mathrm{ft} = 0.3048\ \mathrm{m}$$?

Accepted Answer

$$2.00\ \mathrm{ft} 	imes \frac{0.3048\ \mathrm{m}}{1\ \mathrm{ft}}$$

Question 10

A car moves to the left for 30 minutes, stops for 10 minutes, then moves to the right for 40 minutes. Which position-versus-time graph best represents this motion?

Accepted Answer

A straight line with negative slope, then a horizontal line, then a straight line with positive slope.

Question 11

Which of the following is true about significant figures when multiplying two measured quantities?

Accepted Answer

The answer should have as many significant figures as the number with the fewest significant figures.

Question 12

A rocket is launched vertically with an acceleration of $$15\ \mathrm{m/s^2$}$$ for 30 s, then runs out of fuel and continues upward while slowing down. What is the direction of the acceleration after the fuel runs out?

Accepted Answer

Downward, because gravity acts downward.

Question 13

Which of the following is an order-of-magnitude estimate for the mass of a typical adult human?

Accepted Answer

$$10^2$$\ \mathrm{kg}$$

Question 14

If an object’s velocity and acceleration vectors point in opposite directions, what is happening to the object?

Accepted Answer

It is slowing down.

Question 15

Which of the following is NOT a step in the general problem-solving strategy in physics?

Accepted Answer

Guess the answer and check if it matches the textbook.

Question 16

A student walks 200 m east, then 100 m west. What is the magnitude of the student’s displacement?

Accepted Answer

$$100\ \mathrm{m}$$

Question 17

Which of the following best describes a vector quantity?

Accepted Answer

A quantity with both magnitude and direction.

Question 18

When adding two vectors graphically, what is the correct procedure?

Accepted Answer

Place the tip of the first vector at the tail of the second, then draw the resultant from the tail of the first to the tip of the second.

Question 19

Which of the following is the correct definition of displacement?

Accepted Answer

The change in position of an object.

Chapter 1: Concepts of Motion – Structured Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드