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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