Q: Which of the following is a correct conversion for 2 feet to meters? (Given: 1 inch = 0.0254 m, 1 foot = 12 inches)

$$2\ \mathrm{ft} \times 12 \times 0.0254 = 0.6096\ \mathrm{m}$$

Question 1

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

Accepted Answer

It points down.

Question 2

Which of the following best describes the information provided by a velocity vector in a motion diagram?

Accepted Answer

It tells both the speed and direction of the object.

Question 3

A car is moving to the right and slowing down. Which of the following statements about the signs of its velocity and acceleration is correct?

Accepted Answer

$$v \u003e 0$$, $$a \u003c 0$$

Question 4

A student walks to school and her position vs. time graph is a straight line with a positive slope. What does this indicate about her motion?

Accepted Answer

She is moving at a constant speed to the right.

Question 5

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

Accepted Answer

$$\frac{\Delta r}{\Delta t}$$

Question 6

A rocket sled accelerates at $$a = 50\ \mathrm{m/s^2$}$$ for $$5.0\ \mathrm{s}$$, then coasts at constant velocity for $$3.0\ \mathrm{s}. $$What is the total distance traveled during the acceleration phase?

Accepted Answer

$$625\ \mathrm{m}$$

Question 7

In a motion diagram, what does it mean if the velocity vectors are getting longer with each frame?

Accepted Answer

The object is speeding up.

Question 8

A particle is moving to the left and speeding up. What are the signs of its velocity and acceleration?

Accepted Answer

Velocity is negative, acceleration is negative.

Question 9

Which of the following is NOT a correct SI unit conversion?

Accepted Answer

1 g = $$10^3 kg$$

Question 10

A position vs. time graph for a car shows a horizontal line. What does this indicate about the car's motion?

Accepted Answer

The car is stopped.

Question 11

A motion diagram shows five dots, each spaced farther apart than the previous one. What does this indicate about the object's motion?

Accepted Answer

The object is speeding up.

Question 12

If a car travels 120 meters in 2 minutes, what is its average speed in meters per second?

Accepted Answer

$$1.0\ \mathrm{m/s}$$

Question 13

Which of the following best describes the acceleration vector when an object moves at constant velocity?

Accepted Answer

It is zero.

Question 14

A student walks to school, slows down at $$t = 3$$ min, then speeds up again. How would this appear on a position vs. time graph?

Accepted Answer

A curve that flattens at $$t = 3$$ min, then steepens.

Question 15

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

Accepted Answer

N/m$$^2$$

Question 16

A car is moving to the left and slowing down. What is the sign of its acceleration?

Accepted Answer

Positive

Question 17

Which of the following best describes the process of drawing a motion diagram for a moving object?

Accepted Answer

Draw several dots representing the object's position at equal time intervals, then connect them with velocity vectors.

Question 18

A car accelerates from rest at $$a = 2\ \mathrm{m/s^2$}$$ for $$10\ \mathrm{s}. $$What is its final velocity?

Accepted Answer

$$20\ \mathrm{m/s}$$

Question 19

Which of the following is a correct conversion for 2 feet to meters? (Given: 1 inch = 0.0254 m, 1 foot = 12 inches)

Accepted Answer

$$2\ \mathrm{ft} 	imes 12 	imes 0.0254 = 0.6096\ \mathrm{m}$$

Motion Diagrams, Velocity, and Acceleration in Kinematics

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