Question 1

Which of the following is a vector quantity?

Accepted Answer

Displacement

Question 2

A runner moves 100 m east, then 40 m west. What is the runner's displacement?

Accepted Answer

$60\ \mathrm{m}$ east

Question 3

Which SI unit is used to measure acceleration?

Accepted Answer

$\mathrm{m/s^2}$

Question 4

A car travels 80 km north in 2 hours, then 60 km south in 1.5 hours. What is the car's average velocity for the entire trip?

Accepted Answer

$5.71\ \mathrm{km/h}$ north

Question 5

Which statement best describes the difference between distance and displacement?

Accepted Answer

Distance is the total path length traveled, displacement is the straight-line change in position.

Question 6

If a measurement is reported as $d = 3.40\ \mathrm{cm}$, what is the uncertainty implied by the significant figures?

Accepted Answer

$\pm 0.01\ \mathrm{cm}$

Question 7

Which of the following is NOT a base SI unit used in mechanics?

Accepted Answer

Newton

Question 8

A cyclist starts from rest and reaches a velocity of $12\ \mathrm{m/s}$ in $4\ \mathrm{s}$. What is the average acceleration?

Accepted Answer

$3\ \mathrm{m/s^2}$

Question 9

Which formula correctly expresses average velocity?

Accepted Answer

$v_{avg} = \frac{\Delta x}{\Delta t}$

Question 10

A student measures the time for a pendulum swing as $t = 2.50\ \mathrm{s}$. If the stopwatch uncertainty is $0.05\ \mathrm{s}$, what is the percent uncertainty?

Accepted Answer

$2\%$

Question 11

Which of the following is true about instantaneous velocity?

Accepted Answer

It is the velocity at a specific instant, found as the limit of average velocity as $\Delta t 	o 0$.

Question 12

A car moves from $x_1 = 10\ \mathrm{m}$ to $x_2 = -5\ \mathrm{m}$ in $3\ \mathrm{s}$. What is its average velocity?

Accepted Answer

$-5\ \mathrm{m/s}$

Question 13

Which of the following is a correct statement about significant figures?

Accepted Answer

They indicate the number of reliably known digits in a measurement.

Question 14

A ball rolls $5\ \mathrm{m}$ east, then $3\ \mathrm{m}$ west, then $2\ \mathrm{m}$ east. What is the total displacement?

Accepted Answer

$4\ \mathrm{m}$ east

Question 15

Which of the following is NOT a scalar quantity?

Accepted Answer

Acceleration

Question 16

A train moves with a constant velocity of $30\ \mathrm{m/s}$ for $10\ \mathrm{s}$. What is its displacement?

Accepted Answer

$300\ \mathrm{m}$

Question 17

Which of the following best describes acceleration?

Accepted Answer

The rate of change of velocity with respect to time.

Question 18

A student records a measurement as $t = 5.0\ \mathrm{s} \pm 0.1\ \mathrm{s}$. What is the relative uncertainty?

Accepted Answer

$0.02$

Question 19

Which of the following is a correct SI unit conversion?

Accepted Answer

$1\ \mathrm{km} = 1000\ \mathrm{m}$

Question 20

A car accelerates from $10\ \mathrm{m/s}$ to $30\ \mathrm{m/s}$ in $5\ \mathrm{s}$. What is its average acceleration?

Accepted Answer

$4\ \mathrm{m/s^2}$

Physics 1200: Measurement, Units, Scalars, and Vectors – Study Guide

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