Question 1

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

Accepted Answer

Average speed is the total distance traveled divided by the time interval, while average velocity is the displacement divided by the time interval.

Question 2

A car travels 100 m east in 10 s, then 100 m west in 10 s. What is the car's average velocity over the entire trip?

Accepted Answer

$$\displaystyle \frac{0\ \mathrm{m}}{20\ \mathrm{s}} = 0\ \mathrm{m/s}$$

Question 3

A motion diagram shows the distance between dots increasing with each frame. What does this indicate about the object's motion?

Accepted Answer

The object is speeding up.

Question 4

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

Accepted Answer

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

Question 5

A runner completes a 400 m lap around a track in 50 s. What is her average velocity?

Accepted Answer

$$0\ \mathrm{m/s}$$

Question 6

A ball is thrown straight up. At its highest point, what is the direction of its acceleration?

Accepted Answer

Downward

Question 7

A cyclist slows down as she approaches a stop sign. Which statement is true about her acceleration and velocity vectors?

Accepted Answer

Acceleration and velocity point in opposite directions.

Question 8

A car accelerates from rest up a hill inclined at $$20^\circ to $$the horizontal. Which model is most appropriate for analyzing its motion?

Accepted Answer

Treat the car as a particle.

Question 9

Convert a speed of $$60\ \mathrm{mph} to$$ $$\mathrm{m/s}$$ using the conversion factor $$1\ \mathrm{mph} = 0.447\ \mathrm{m/s}.$$

Accepted Answer

$$26.8\ \mathrm{m/s}$$

Question 10

Which of the following numbers has the greatest number of significant figures?

Accepted Answer

$$4.321 	imes 10$$^{-10}$$

Question 11

A student walks 3 m east, then 4 m north. What is the magnitude of her displacement?

Accepted Answer

$$5\ \mathrm{m}$$

Question 12

A weather rocket accelerates upward at $$30\ \mathrm{m/s^2$}$$ for $$30\ \mathrm{s}$$, then runs out of fuel. What is the rocket's velocity at the moment it runs out of fuel?

Accepted Answer

$$900\ \mathrm{m/s}$$

Question 13

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

Accepted Answer

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

Question 14

A position-versus-time graph for a car shows a straight line with a negative slope. What does this indicate about the car's motion?

Accepted Answer

The car is moving at constant speed to the left.

Question 15

A stopwatch is used to measure the time interval for a runner to complete a race. If the runner starts at $$t_i = 2.0\ \mathrm{s}$$ and finishes at $$t_f = 12.5\ \mathrm{s}$$, what is the time interval?

Accepted Answer

$$10.5\ \mathrm{s}$$

Question 16

A skier glides at constant speed on horizontal snow, then speeds up down a hill. Which statement about the skier's acceleration is correct?

Accepted Answer

Acceleration is zero on the horizontal and positive down the hill.

Question 17

Which prefix represents $$10^{-6} in $$the SI system?

Accepted Answer

micro-

Question 18

A car moves with constant velocity. What can you say about its acceleration?

Accepted Answer

Acceleration is zero.

Question 19

A particle moves along the x-axis with $$x  0$$ but is slowing down. What is the sign of its acceleration $$a_x$$?

Accepted Answer

Negative

Chapter 1: Concepts of Motion – Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards