Chapter 3: Linear Motion (from Lecture Slides)

Question 1

Motion of objects is always described as relative to

Answer 1

Earth and Sun

Question 2

Motion relative to the Sun is

Answer 2

Different from the motion relative to Earth

Question 3

Speed

Answer 3

Distance covered per amount of time traveled

Question 4

Speed equal to

Answer 4

Distance/time = v = d/t

Question 5

Speed is

Answer 5

Units are meters per seconds

Question 6

Average speed

Answer 6

The total distance covered divided by the total time and does not indicate various speeds along the way

Question 7

Average speed equal to

Answer 7

Total distance covered / time interval = v = d/t

Question 8

If known the average speed and time of travel

Answer 8

Total distance traveled = average speed x total time

Question 9

Total distance equal to (Dtot = )

Answer 9

v(theta)t

Question 10

Instantaneous speed

Answer 10

Speed at any instant

Question 11

Instantaneous speed usually starts at

Answer 11

From a speed of zero then approach their maximum speed

Question 12

Velocity

Answer 12

Speed + direction

Question 13

A vector quantity description of both:

Answer 13

Speed (magnitude) of the object and direction of travel

Question 14

Displacement (Formula) over time (Formula)

Answer 14

Theta (x) = Xf - Xi / (t) = tf - ti

Question 15

Constant speed

Answer 15

“Steady speed” neither speeding up nor slowing down

Question 16

Constant velocity

Answer 16

Constant speed and constant direction (straight line path with no acceleration)

Question 17

Changing velocity

Answer 17

Speed, direction and or both

Question 18

Acceleration formulated by

Answer 18

Galileo based on his experiment with inclined planes and rate at wich velocity changes over time

Question 19

Slope downward

Answer 19

Speed increases

Question 20

Slope upward

Answer 20

Speed decreases

Question 21

No Slope

Answer 21

Does speed change?

Question 22

Acceleration

Answer 22

Rate at which velocity changes over time

Question 23

Acceleration (Formula)

Answer 23

Change in velocity / time interval = a = v(delta) / t(delta)

Question 24

Acceleration involves a change in

Answer 24

Speed and direction or both

Question 25

Any change in velocity implies acceleration

Answer 25

Speed up, slow down, turn or curved path

Question 26

Galileo increased the inclination of inclined plane were

Answer 26

Steeper inclines result in greater accelerations

Question 27

When the incline is vertical, acceleration is at

Answer 27

Maximum, the same as that of a falling object

Question 28

When air resistance is negligible, all objects fall with

Answer 28

The same unchanging acceleration

Question 29

Free-fall

Answer 29

Falling under the influence of gravity only with no air resistance

Question 30

Free falling object on Earth accelerate at the rate of about

Answer 30

10 m/s^2 or 9.8 m/s^2

Question 31

The velocity acquired by an object starting from rest is

Answer 31

Velocity = Acceleration x Time (V = at)

Question 32

Once released upward, it continues to

Answer 32

Move upward for a time and then comes back down

Question 33

At the object’s highest point, when it is

Answer 33

Changing its direction of motion from upward to downward, its instantaneous speed is zero

Question 34

Free fall starts downward just as if it had been

Answer 34

Dropped from rest at that height

Question 35

The distance covered by an accelerating object starting from rest is

Answer 35

Distance = 1/2 x Acceleration x Time^2

Question 36

Under free fall, when acceleration is

Answer 36

10 m/s^2

Question 37

Free fall (Formula)

Answer 37

d = 1/2at^2

Question 38

Speed is a measure of

Answer 38

How fast and scalar (magnitude only)

Question 39

Velocity is a measure of

Answer 39

Both how fast and in which direction

Question 40

Vector

Answer 40

Magnitude and direction

Question 41

Speed is the

Answer 41

Magnitude of velocity