Q: Which of the following is the correct method for converting $$2.00$$ feet to meters?

$$2.00\ \mathrm{ft} \times \frac{12\ \mathrm{in}}{1\ \mathrm{ft}} \times \frac{2.54\ \mathrm{cm}}{1\ \mathrm{in}} \times \frac{1\ \mathrm{m}}{100\ \mathrm{cm}}$$

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 an object’s positions 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 cyclist decelerates from $$20\ \mathrm{m/s} to $$rest in $$4\ \mathrm{s}. $$What is the average acceleration?

Accepted Answer

$$\displaystyle \frac{0 - 20}{4} = -5\ \mathrm{m/s^2$}$$

Question 6

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

Accepted Answer

Downward

Question 7

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

Accepted Answer

Displacement

Question 8

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

Accepted Answer

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

Question 9

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

Accepted Answer

micro-

Question 10

A car accelerates from rest up a $$20^\circ$$ hill. Which of the following best describes the orientation of the velocity vectors in its motion diagram?

Accepted Answer

The velocity vectors are at a $$20^\circ$$ angle to the horizontal, increasing in length.

Question 11

A student walks to school, stops for a break, then continues walking. Which position-versus-time graph best represents this motion?

Accepted Answer

A straight line with positive slope, a horizontal line, then a straight line with positive slope.

Question 12

Which of the following is the correct method for converting $$2.00$$ feet to meters?

Accepted Answer

$$2.00\ \mathrm{ft} 	imes \frac{12\ \mathrm{in}}{1\ \mathrm{ft}} 	imes \frac{2.54\ \mathrm{cm}}{1\ \mathrm{in}} 	imes \frac{1\ \mathrm{m}}{100\ \mathrm{cm}}$$

Question 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

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

Question 16

A weather rocket is launched vertically with an acceleration of $$30\ \mathrm{m/s^2$}$$ for $$30\ \mathrm{s}$$, then runs out of fuel and continues upward. What is the acceleration of the rocket immediately after it runs out of fuel (neglecting air resistance)?

Accepted Answer

$$9.8\ \mathrm{m/s^2$}$$ downward

Question 17

Which of the following is the best estimate for the mass of a science textbook?

Accepted Answer

$$1\ \mathrm{kg}$$

Question 18

When adding two vectors $$\vec{A}$$ and $$\vec{B}$$ graphically, what is the correct procedure?

Accepted Answer

Place the tail of $$\vec{B} at $$the tip of $$\vec{A}$$, then draw the resultant from the tail of $$\vec{A} to $$the tip of $$\vec{B}.$$

Chapter 1: Concepts of Motion – Physics with Calculus Study Notes

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