Question 1

Which of the following best describes the difference between translational and rotational motion?

Accepted Answer

Translational motion involves an object moving through space, while rotational motion involves an object rotating about an axis.

Question 2

A composite image of a runner in a race shows equally spaced positions at each time interval. What does this indicate about the runner's motion?

Accepted Answer

The runner is moving with constant speed.

Question 3

In the particle model, how is an object's motion simplified?

Accepted Answer

By concentrating all its mass at a single point in space.

Question 4

Given the position vector $$\vec{r}_3 at$$ $$t = 3\ 	ext{s} is$$ $$(15\ 	ext{m}, 15\ 	ext{m})$$ and its magnitude is $$21\ 	ext{m}$$, what is the direction of the vector?

Accepted Answer

$$45^\circ$$

Question 5

Which equation correctly represents the displacement vector between two points $$\vec{r}_4$$ and $$\vec{r}_3$$?

Accepted Answer

$$\Delta \vec{r} = \vec{r}_4 - \vec{r}_3$$

Question 6

A car travels 1200 meters. Which is the most appropriate way to express this distance using SI prefixes?

Accepted Answer

1.2 km

Question 7

If a student walks 500 meters in 10 minutes, what is her average speed in meters per second?

Accepted Answer

$$0.83\ 	ext{m/s}$$

Question 8

Which of the following quantities is a vector?

Accepted Answer

Velocity

Question 9

A car moves from position $$x_1 = 10$$\ 	ext{km}$$ to x_2$ = -20\ 	ext{km} in 30 $$minutes. What is the displacement?

Accepted Answer

$$-30\ 	ext{km}$$

Question 10

Which equation gives the average velocity $$\vec{v}_{avg} of an $$object?

Accepted Answer

$$\vec{v}_{avg} = \frac{\Delta \vec{r}}{\Delta t}$$

Question 11

If the velocity vector $$\vec{v}$$ and acceleration vector $$\vec{a}$$ point in the same direction, what is happening to the object?

Accepted Answer

The object is speeding up.

Question 12

A measurement is reported as $$0.00620. $$How many significant figures does it have?

Accepted Answer

4

Question 13

Which SI unit is defined by the distance light travels in a vacuum during $$1/299,292,458 of a $$second?

Accepted Answer

Meter

Question 14

A mass of $$6.47\ 	ext{kg} is $$combined with a piece of aluminum with volume $$4.44 	imes 10$$^{-4}$$\ 	ext{m}^3$$ and density $$2.7 	imes 10^3$\ 	ext{kg/m}^3. $$What is the total mass, rounded to the correct number of significant figures?

Accepted Answer

$$7.7\ 	ext{kg}$$

Question 15

Which of the following is NOT a basic SI unit?

Accepted Answer

Newton

Question 16

A car moves with constant speed. Which of the following statements is true about its motion diagram?

Accepted Answer

The distance between each position remains constant.

Question 17

Which prefix represents $$10^{-6}$$?

Accepted Answer

Micro-

Question 18

If you convert $$2.00\ 	ext{ft} to $$centimeters using $$1\ 	ext{in} = 2.54\ 	ext{cm}$$ and $$1\ 	ext{ft} = 12\ 	ext{in}$$, what is the result?

Accepted Answer

$$61.0\ 	ext{cm}$$

Question 19

When adding or subtracting measured values, how should you determine the number of decimal places in the answer?

Accepted Answer

Match the smallest number of decimal places of any number used in the calculation.

Chapter 1: Concepts of Motion – Foundations of Kinematics

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