Chapter 11

Question 0

a system for specifying the precise location of objects in space and time

Answer 0

Frame of reference

Question 1

An object’s change in position relative to a reference point

Answer 1

Motion

Question 2

Objects move when their position changes in relation to a ________.

Answer 2

reference point

Question 3

Distance measures the ______.

Answer 3

Path taken

Question 4

What is the measure of the path taken?

Answer 4

(Distance) How far an object moves

Question 5

Displacement is the change of an ______.

Answer 5

Objects position

Question 6

The change in an objects position with a direction indicator

Answer 6

Displacement

Question 7

Can distance be a straight line?

Answer 7

Yes

Question 8

Must displacement be a straight line?

Answer 8

Yes

Question 9

the distance traveled divide by the time interval during which the motion occurred

Answer 9

Speed

Question 10

What is the formula for speed?

Answer 10

v=d/t

Question 11

Why is speed represented with the variable v?

Answer 11

Because the SI units are m/s

Question 12

What is achieved when an object covers equal distance in equal amount of time?

Answer 12

Constant speed
(No change in speed)

Question 13

What is the triangle for speed?

Answer 13

d
v | t
(t must be cursive and lower cased)

Question 14

Speed can be studied in _____.

Answer 14

Graphs

Question 15

The steeper the slope, the ____ the speed the object possesses.

Answer 15

Greater

Question 16

Time is always on the _ axis, and distance is always on the _ axis.

Answer 16

time, x-axis

distance, y-axis

Question 17

Slope=

Answer 17

change in y / change in x

Question 18

How is average speed calculated?

Answer 18

distance/ time

Question 19

Ex. Calculate the average speed of a runner who runs 132m in a time of 18 sec.

Answer 19

v=d/t 132m/18s= 7.3m/s

Question 20

What is the speed at a given point in time?

Answer 20

Instantaneous Speed

Question 21

What describes both speed and direction?

Answer 21

Velocity

Question 22

What is the speed of an object in a particular direction?

Answer 22

Velocity

Question 23

Math practice on page 369!!

Question 24

What is a combination of 2 velocities?

Answer 24

Resultant velocity

Question 25

Do you add vectors in resultant velocity?

Answer 25

YAS

Question 26

Airplane flying at 350 km/hr W and a jet stream with a velocity of 55 km/hr E.

Answer 26

Draw Vectors tip to tail. | 350-55= 295 km/hr

Question 27

What shows distance on the vertical axis and time on the horizontal axis?

Answer 27

Plot graphs

Question 28

Practice graphing on page 370

Question 29

What equals speed in a plot graph?

Answer 29

The slope of a distance vs. time graph equals speed

Question 30

-the rate at which velocity changes over time; an object accelerates if it's speed, direction, or both changes

Answer 30

Acceleration

Question 31

Uniform circular motion has ____ acceleration.

Answer 31

centripetal

Question 32

What's the formula for calculating acceleration?

Answer 32

a= (final velocity - initial velocity)/ time

Question 33

a=

Answer 33

/\v/t

Question 34

Math practice on page 375!!!

Question 35

Can acceleration be determined from a velocity vs. time graph?

Answer 35

YAS

Question 36

The slope of the line gives the value of _____.

Answer 36

Acceleration

Question 37

Positive slope=

Answer 37

Increase in acceleration

Question 38

Negative slope=

Answer 38

Decrease in acceleration

Question 39

An action exerted on a body in order to change the body's state of rest or motion; force has both magnitude and direction

Answer 39

Force

Question 40

What are the four fundamental forces?

Answer 40

Gravity Electromagnetic Strong nuclear force Weak nuclear force

Question 41

Name two things that can stop an object to move or to stop moving.

Answer 41

Contact forces | Field forces

Question 42

Give an example of a contact force.

Answer 42

Push a cart

Question 43

Give an example of a field force.

Answer 43

Gravity

Question 44

To what direction do objects accelerate?

Answer 44

In the direction of the net force

Question 45

Do balanced forces change motion?

Answer 45

No

Question 46

____ forces do not cancel out completely.

Answer 46

Unbalanced

Question 47

a force that opposes motion between two surfaces that are in contact

Answer 47

Friction

Question 48

The force that resists the iniation of sliding motion between two surfaces that are in contact and at rest

Answer 48

Static Friction

Question 49

The force that opposes the movement of two surfaces that are in contact and are moving over each other

Answer 49

Kinetic friction

Question 50

Name two different types of kinetic friction.

Answer 50

Sliding friction | Rolling friction

Question 51

Are all kinetic frictions the same?

Answer 51

No

Question 52

What also opposes motion besides friction?

Answer 52

Air resistance

Question 53

Give an example of air resistance

Answer 53

Fluid friction

Question 54

How can harmful friction be reduced?

Answer 54

By lubricants

Question 55

Helpful friction can be ____.

Answer 55

Increased