Which of the following is the odd one out Mass Speed Force Temperature Distance Elephant Which of the following is the odd one out Mass Speed Force Temperature Distance Elephant Scalars ID: 395545
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Slide1
Scalars and vectorsSlide2
Which of the following is the odd one out?
Mass
Speed
Force
Temperature
Distance
ElephantSlide3
Which of the following is the odd one out?
Mass
Speed
Force
Temperature
Distance
ElephantSlide4
Scalars
Scalar
quantities have a
magnitude (size)
only
.
For example:
Temperature, mass, distance,
speed, energy.1 kgSlide5
Vectors
Vector
quantities have a
magnitude (size) and
direction
.
For example:
Force, acceleration, displacement,
velocity, momentum.10 NSlide6
Scalars
and
Vectors
scalars
vectors
Magnitude (size)
No
direction
Magnitude and
direction
temperature
mass
speed
velocity
force
accelerationSlide7
Scalars
and
Vectors
scalars
vectors
Magnitude (size)
No
direction
Magnitude and
direction
temperature
mass
speed
velocity
force
accelerationSlide8
Representing vectors
Vectors can be represented by arrows. The length of the arrow indicates the
magnitude
, and the direction the
direction!Slide9
Adding vectors
When adding vectors (such as force or velocity) , it is important to remember they are vectors and their direction needs to be taken into account.
The result of adding two vectors is called the
resultant
.Slide10
Adding vectors
For example;
6 N
4 N
2 N
4 m/s
4 m/s
5.7 m/s
Resultant
force
Resultant
velocitySlide11
Adding vectors
For example;
6 N
4 N
2 N
Resultant
forceSlide12
An interesting example
Think of a dog
orbiting
the earth with constant speed (in a circle).Slide13
An interesting example
At this point, what is its
velocity
?
velocity?Slide14
An interesting example
velocitySlide15
An interesting example
velocity?
What is its
velocity
here?Slide16
An interesting example
velocity
As you can see the velocity has
changed
as it is now going in another direction.Slide17
An interesting example
velocity
We have
constant speed
but
changing velocity
.
Of course a changing velocity means it must be
accelerating
! We’ll come back to this in year 12!Slide18
Question
Suppose you lay 3 metre rulers on the floor end-to-end to represent 3 vectors of equal magnitude. How could you produce a final vector of
A) the largest magnitude
B) the smallest magnitude
C) a magnitude of the length of 1 ruler Slide19
A) end to end = 3m
B) in a triangle = 0m
C) on top of each other, or 2 end to end with another on topSlide20
Flying in a side wind
A
bird flies at a steady speed of 3 m s–1 through the air. It is pointing in the direction due north. However, there is a wind blowing from west to east at a speed of 2
ms
–1.1. What is the velocity of the bird relative to the ground
?
2. What is the displacement of the bird, relative to its starting point, after it has flown
for20
seconds
? 3. In what direction should the bird point if it is to travel in a northerly direction?