Unit B Energy Flow in Technological Systems : Section 1.0

Question 1

How can we tell if an object has moved?

Answer 1

We can analyze the motion of an object in comparison to another point

Question 2

What is a reference point?

Answer 2

A point that we use to analyze the motion of an object

Question 3

When does the motion of an object occur?

Answer 3

When an imaginary line attached to the reference point increases or decreases in distance or changes direction.

Question 4

What is uniform motion?

Answer 4

When an object is traveling at constant rate of motion in a constant direction

Question 5

What is average speed?

Answer 5

A uniform motion that involves traveling a distance in a specific time

Question 6

What does the letter v mean in a mathematical formula?

Answer 6

Speed

Question 7

What does a triangle mean before a letter in a chemical formula?

Answer 7

Difference in

Question 8

What is the formula for average speed?

Answer 8

v = d/t

or (final position - initial position)/ change in time

Question 9

What is the formula for slope?

Answer 9

Rise/run

Change in y / change in x

Change in dependent variable / change in independent variable

Question 10

Where does time go on a distance-time graph?

Answer 10

On the x-axis

Question 11

Where does distance go on a distance-time graph?

Answer 11

The y-axis

Question 12

What does a slope calculate in a distance-time graph?

Answer 12

Average speed

Question 13

What does a straight line in a distance-time graph represent?

Answer 13

Uniform motion (constant speed)

Question 14

What does a straight horizontal line on a speed-time graph represent?

Answer 14

the speed remains constant

Question 15

What does the slope of a speed-time graph confirm?

Answer 15

Whether or not the motion is uniform, because when the slope is 0, the speed is constant and thus you have uniform motion.

You can also know the acceleration specifically.

Question 16

How can you calculate the distance an object traveled on a speed-time graph?

Answer 16

By calculating the area underneath the graph

Question 17

What is velocity?

Answer 17

The rate of motion and direction of an object

Question 18

What is a scalar quantity?

Answer 18

A scalar quantity only represents the magnitude or how much and does not include direction

Question 19

What is a vector quality?

Answer 19

A vector quality includes the magnitude or how much and a direction

Question 20

How can you tell if something is a vector quality?

Answer 20

It will include an arrow showing direction

Question 21

What is distance?

Answer 21

A scalar quantity that measures the distance traveled by an object from a reference point

Question 22

What is displacement?

Answer 22

a vector quantity is a change in distance and direction from a reference point

Question 23

What is the formula for average velocity?

Answer 23

displacement / time elapsed or

final distance - initial distance / final time - initial time

Question 24

What does the slope represent on a position-time graph?

Answer 24

Velocity

Question 25

What goes on the x-axis on a position-time graph?

Answer 25

Time t (s)

Question 26

What goes on the y-axis on a position-time graph?

Answer 26

Position d (m)

Question 27

Is acceleration a vector or scalar quanitity?

Answer 27

Vector

Question 28

What is acceleration?

Answer 28

Change in velocity in different specific time intervals

Question 29

What are the 2 ways of positive acceleration?

Answer 29

• When an object has a positive magnitude of velocity and is increasing in a positive direction
• When the change in velocity is negative and the direction is negative

Question 30

What are 2 ways of negative acceleration?

Answer 30

• When the direction is negative and the change is velocity is positive
• When the change in velocity is negative and the direction is positive

Question 31

What is the formula for acceleration?

Answer 31

Acceleration = change in velocity/change in time

Question 32

For acceleration, what will the best fit line look like on a position time graph?

Answer 32

A smooth curve

Question 33

What will a positively accelerating slope look like?

Answer 33

Will start from zero and look like half of a happy face

Question 34

What will a negatively accelerating slope look like?

Answer 34

Start at 0 and look like half of a sad face

Question 35

What will you figure out if you calculate the slope of a velocity-time graph?

Answer 35

The acceleration

Question 36

What is a force?

Answer 36

A push or pull on an object

Question 37

What is force measured in?

Answer 37

Newtons (N)

Question 38

What happens in an unbalanced force?

Answer 38

The force acting in one direction is greater than the force in the opposite direction and thus movement occurs

Question 39

What is work?

Answer 39

When energy is applied to an object and it moves a distance

Question 40

What is the formula for work?

Answer 40

Work = force x distance

Question 41

What is work measured in?

Answer 41

Joules

Also (kg)(m/s²)(m) since force times distance is work. Use Joules when recording your final answer.

Question 42

What is 1 joule equal to?

Answer 42

(1kg x m/s²) x m

Since force times distance is work and work is energy. Force is mass times acceleration. Here force is measured with kg times m/s². Distance is measured with metres.

also Nm Newton metre

Question 43

What are the 3 conditions for work to be done on an object?

Answer 43

• Must be movement
• There must be a force
• The force and distance must be in the same direction

Question 44

What should be equal to work output?

Answer 44

Work input if there is the absense of friction