Question 1

A runner jogs 400 m east, then 300 m north. What is the magnitude of her net displacement from the starting point?

Accepted Answer

$$500\ \mathrm{m}$$

Question 2

Which of the following statements best distinguishes between speed and velocity?

Accepted Answer

Velocity contains information about the direction of motion while speed does not.

Question 3

A car moves from $$x = -20\ \mathrm{m} to$$ $$x = 35\ \mathrm{m} in$$ $$5\ \mathrm{s}. $$What is its average velocity?

Accepted Answer

$$7\ \mathrm{m/s}$$

Question 4

A hiker walks $$2.0\ \mathrm{km}$$ north, then $$3.0\ \mathrm{km}$$ east. What is the direction of her net displacement relative to east?

Accepted Answer

$$33.7^\circ$$ north of east

Question 5

Which of the following is a scalar quantity?

Accepted Answer

Speed

Question 6

A student walks $$100\ \mathrm{m} to $$the right, then $$200\ \mathrm{m} to $$the left. What is the direction of her displacement vector?

Accepted Answer

Points to the left

Question 7

A measurement is recorded as $$2.67 	imes 10^3$. How many significant figures does this value have?

Accepted Answer

3

Question 8

Which of the following are the correct SI units for distance and mass?

Accepted Answer

Meters, kilograms

Question 9

A ball is thrown at a $$60^\circ$$ angle above the horizontal and caught at the same height. Which statement about its velocity vectors during flight is correct?

Accepted Answer

The velocity vectors change in both magnitude and direction.

Question 10

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

Accepted Answer

$$35\ \mathrm{mi}$$

Question 11

If a number is written as $$0.0000075 in $$scientific notation, what is the correct representation?

Accepted Answer

$$7.5 	imes 10$$^{-6}$$

Question 12

A cyclist rides $$3\ \mathrm{mi}$$ east of a water tower at noon. At 12:30 PM, she is $$2\ \mathrm{mi}$$ west of the tower. What is her displacement during this half-hour?

Accepted Answer

$$-5\ \mathrm{mi}$$

Question 13

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 14

A student walks $$90\ \mathrm{m}$$ east and then $$50\ \mathrm{m}$$ north. What is the magnitude of her net displacement?

Accepted Answer

$$100\ \mathrm{m}$$

Question 15

Which of the following is the correct formula for average velocity?

Accepted Answer

$$v = \frac{\Delta x}{\Delta t}$$

Question 16

A person walks $$1\ \mathrm{mi}$$ northeast, then $$1\ \mathrm{mi}$$ south. What is the magnitude of her net displacement?

Accepted Answer

$$\sqrt{2 - \sqrt{2}}\ \mathrm{mi}$$

Question 17

Which of the following best describes the process of adding two vectors graphically?

Accepted Answer

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

Question 18

A motion diagram shows dots spaced farther apart as time increases. What does this indicate about the object's motion?

Accepted Answer

The object is speeding up.

Question 19

Which of the following is an order-of-magnitude estimate for the speed of walking in meters per second?

Accepted Answer

$$1\ \mathrm{m/s}$$

Chapter 1: Representing Motion – College Physics Study Notes

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