Motion in One Dimension

Question 1

What is a vector?

Answer 1

A physical quantity which has both magnitude and direction

Question 2

What is a scalar?

Answer 2

A physical quantity which has magnitude only

Question 3

What is distance?

Answer 3

The length of a path

Question 4

What is a displacement?

Answer 4

A change in the position of something

Question 5

What is magnitude?

Answer 5

The size of a physical quantity

Question 6

What kind of quality is speed?

Answer 6

A scalar

Question 7

What kind of quality is distance?

Answer 7

Scalar

Question 8

What kind of quality is energy?

Answer 8

A scalar

Question 9

What kind of quality is velocity?

Answer 9

A vector

Question 10

What kind of quality is mass?

Answer 10

Scalar

Question 11

What kind of quality is weight?

Answer 11

Vector

Question 12

How is a vector represented?

Answer 12

A straight line-the length of the line represents the magnitude
An arrow head- shows the direction

Question 13

How is direction described?

Answer 13

Conventional points (Left, right, etc.)
Cardinal points (North, South etc.)
In degrees (measured from the horizontal)

Question 14

What is a resultant vector?

Answer 14

A single vector that has the same effect as all the component vectors together would have

Question 15

How do you get resultant vectors?

Answer 15

Formula first
Replace with numbers
Write the answer with the magnitude and the direction

Question 16

What is a maximum vector?

Answer 16

It is when two vectors act in the same direction, i.e the angle between them is 0°

Question 17

How do you get the resultant vector of a maximum resultant?

Answer 17

Find the sum of the two magnitudes

Question 18

What is a minimum resultant?

Answer 18

It occurs when two vectors act in opposite directions i.e the angle between them is 180°

Question 19

How do you get the resultant vector of a minimum resultant?

Answer 19

Find the difference between the magnitudes of the two vectors

Question 20

When adding two vectors with opposite directions, how do you show direction?

Answer 20

The vector going to the right is positive
The vector going to the left will be negative
If your final answer is positive the resultant vector is to the right
If your final answer is negative, the resultant vector is to the right

Question 21

Explain the difference between displacement and distance

Answer 21

Someone walks forward 3m
They then walk backward 3m
Their displacement is 0 (they are in the same place)
Their distance is 6m (that is how far they travelled)

Question 22

How is position measured?

Answer 22

Relative to a reference point

Question 23

What kind of quantity is position?

Answer 23

A vector

Question 24

What is the symbol for position?

Answer 24

X

Question 25

What is a reference point?

Answer 25

A starting point for a vector

Question 26

How is displacement represented?

Answer 26

By Δx

Question 27

How do you work out displacement?

Answer 27

By figuring out what the straight line distance between the reference point and the new position is
The direction in which the body has moved

Question 28

What kind of quantity is displacement?

Answer 28

A vector quality

Question 29

How can you change the resultant of two vectors without changing the magnitude?

Answer 29

Change the angle between the two vectors

Question 30

What is velocity?

Answer 30

Rate of change in displacement divided by time

Question 31

What is speed?

Answer 31

Rate of change in distance over time

Question 32

What is velocity measured in?

Answer 32

Metres per second

And the direction

Question 33

What is speed measured in?

Answer 33

Metres per second

No direction

Question 34

What is distance measured in?

Answer 34

m

Question 35

What is displacement measured in?

Answer 35

Metres from a reference point

Question 36

What happens during acceleration?

Answer 36

The speed increases

Question 37

What does a constant velocity mean?

Answer 37

For every unit of time, the distance remains the same

Question 38

What is acceleration?

Answer 38

The rate of change of velocity

Question 39

What is acceleration measured in?

Answer 39

Metres per second squared

Question 40

What is the formula for displacement?

Answer 40

Xf-xi= Δx

Final position minus the initial position

Question 41

How do you find average velocity?

Answer 41

Find your total displacement

Divide by your total time

Question 42

What is instantaneous velocity?

Answer 42

The velocity at a particular moment

Question 43

How is instantaneous velocity calculated?

Answer 43

Displacement over an extremely small (almost zero) time interval

Question 44

What is the base unit of speed and velocity?

Answer 44

m/s

Question 45

How do you convert km/h to m/s?

Answer 45

Divide by 3,6

Question 46

What happens to acceleration when velocity increases?

Answer 46

Acceleration is positive

Question 47

What happens to acceleration when velocity decreases?

Answer 47

It is negative

Question 48

What two factors could cause negative acceleration?

Answer 48

The object is slowing down

The object is speeding up, but in the opposite direction

Question 49

What is the difference between speed and velocity?

Answer 49

Velocity acts in a particular direction, speed does not have direction