Q: A car travels 120 km east in 2 hours, then 160 km north in 3 hours. What is the magnitude of the car's net displacement from its starting point?

$\sqrt{(120^2 + 160^2)} = 200\ \text{km}$

Q: A runner moves from $x = -5\ \text{m}$ to $x = 15\ \text{m}$ in $4\ \text{s}$. What is the runner’s average velocity?

$\frac{15 - (-5)}{4} = 5\ \text{m/s}$

Q: A ball is thrown with a velocity of $10\ \text{m/s}$ at an angle of $30^\circ$ above the horizontal. What is the horizontal component of its velocity?

$10 \cos 30^\circ = 8.66\ \text{m/s}$

Q: Convert $3.5\ \text{miles}$ to kilometers using the conversion $1\ \text{mile} = 1.609\ \text{km}$.

$3.5 \times 1.609 = 5.63\ \text{km}$

Q: A cyclist rides $2.0\ \text{km}$ east, then $3.0\ \text{km}$ north. What is the magnitude of the net displacement?

$\sqrt{2.0^2 + 3.0^2} = 3.6\ \text{km}$

Q: A goose flies $21\ \text{mi}$ north, then $28\ \text{mi}$ east. What is the straight-line distance from its starting point to its final position?

$\sqrt{21^2 + 28^2} = 35\ \text{mi}$

Q: A car moves at a constant speed of $60\ \text{km/h}$ for $2.5\ \text{h}$. What distance does it travel?

$60 \times 2.5 = 150\ \text{km}$

Q: A student walks $0.75\ \text{km}$ in $10$ minutes. What is her average speed in m/s? (1 km = 1000 m)

$\frac{750}{600} = 1.25\ \text{m/s}$

Question 1

A car travels 120 km east in 2 hours, then 160 km north in 3 hours. What is the magnitude of the car's net displacement from its starting point?

Accepted Answer

$\sqrt{(120^2 + 160^2)} = 200\ 	ext{km}$

Question 2

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

Accepted Answer

It treats a moving object as if all its mass were concentrated at a single point.

Question 3

A runner moves from $x = -5\ 	ext{m}$ to $x = 15\ 	ext{m}$ in $4\ 	ext{s}$. What is the runner’s average velocity?

Accepted Answer

$\frac{15 - (-5)}{4} = 5\ 	ext{m/s}$

Question 4

Which of the following is a vector quantity?

Accepted Answer

Displacement

Question 5

A ball is thrown with a velocity of $10\ 	ext{m/s}$ at an angle of $30^\circ$ above the horizontal. What is the horizontal component of its velocity?

Accepted Answer

$10 \cos 30^\circ = 8.66\ 	ext{m/s}$

Question 6

Convert $3.5\ 	ext{miles}$ to kilometers using the conversion $1\ 	ext{mile} = 1.609\ 	ext{km}$.

Accepted Answer

$3.5 	imes 1.609 = 5.63\ 	ext{km}$

Question 7

Which of the following numbers is correctly written in scientific notation with three significant figures?

Accepted Answer

$4.56 	imes 10^3$

Question 8

A cyclist rides $2.0\ 	ext{km}$ east, then $3.0\ 	ext{km}$ north. What is the magnitude of the net displacement?

Accepted Answer

$\sqrt{2.0^2 + 3.0^2} = 3.6\ 	ext{km}$

Question 9

If a measurement is $0.00450\ 	ext{m}$, how many significant figures does it have?

Accepted Answer

3

Question 10

A goose flies $21\ 	ext{mi}$ north, then $28\ 	ext{mi}$ east. What is the straight-line distance from its starting point to its final position?

Accepted Answer

$\sqrt{21^2 + 28^2} = 35\ 	ext{mi}$

Question 11

Which SI prefix corresponds to $10^{-6}$?

Accepted Answer

micro-

Question 12

A car moves at a constant speed of $60\ 	ext{km/h}$ for $2.5\ 	ext{h}$. What distance does it travel?

Accepted Answer

$60 	imes 2.5 = 150\ 	ext{km}$

Question 13

Which of the following is an example of a scalar quantity?

Accepted Answer

Temperature

Question 14

A student walks $0.75\ 	ext{km}$ in $10$ minutes. What is her average speed in m/s? (1 km = 1000 m)

Accepted Answer

$\frac{750}{600} = 1.25\ 	ext{m/s}$

Question 15

Which of the following best describes the difference between speed and velocity?

Accepted Answer

Velocity includes direction, while speed does not.

Question 16

A measurement is recorded as $2.30 	imes 10^4$. How many significant figures does this value have?

Accepted Answer

3

Question 17

A toy truck moves as shown in the motion diagram (see image_2). What can you infer about its motion?

Accepted Answer

The truck is moving at a constant speed.

Question 18

If you walk $1.0\ 	ext{mile}$ in $20$ minutes, what is your average speed in m/s? (1 mile = 1.609 km)

Accepted Answer

$\frac{1609}{1200} = 1.34\ 	ext{m/s}$

Chapter 1: Representing Motion – Study Notes for College Physics

Study Guide - Practice Questions

Study Guide - Flashcards