AUDIENCE THEORY -CULTIVATION THEORY - GERBNER.pptx
Vektore 11 e
1.
2. Vector Scalar
A physical
quantity that has
magnitude, unit
and direction
A physical
quantity that has
only magnitude
and unit
Eg. Force, Velocity,
Displacement,
Acceleration
Eg. Speed,
Distance, Mass,
Volume
3. Equal Vectors:
Two vectors are equal if the have the
same MAGNITUDE and DIRECTION
Negative Vector:
A vector that points in the opposite
direction as the positive reference
direction
4. Addition of Vectors
MAGNITUDE and DIRECTION is taken
into account
𝑭 𝟏
𝑭 𝟐
𝑭 𝟑
𝑭 𝑻𝒐𝒕 = + +𝑭 𝟏 𝑭 𝟐 −𝑭 𝟑
5. Resultant Vector
A single vector that has the same
effect as all the other vectors together
𝑭 𝟏 𝑭 𝟐
𝑭 𝑹
𝑭 𝑹 = 𝑭 𝟏 + 𝑭 𝟐
6.
7. Draw the following vectors. Use a scale
of 1 cm:1 N
a) 5 N 30°
b) 4 N 20° S van W
c) 5 N 200°
10. Johnny walks 50 m in the direction
50º. He then turns and walks
another 10 m in the direction 120º.
Determine his displacement by
means of a scale drawing
11. Choose a scale
Choose method to be used
Draw vectors to scale
Draw resultant
Measure the resultant and determine its
direction using a protractor
Convert the measured value of the
resultant to the real value using the scale
13. Johnny walks 50 m in the direction
50º. He then turns and walks
another 10 m in the direction 120º.
Determine his displacement by
means of a scale drawing
21. Resolve each vector into its
perpendicular components
Add all the x-components
Add all the y-components
𝑭 𝑵𝑬𝑻 𝒙 = 𝑭 𝒙
𝑭 𝑵𝑬𝑻 𝒚 = 𝑭 𝒚
22. Calculate the magnitude of the
resultant using pythagoras
Calculate the direction of the
resultant using trigonometric
relationships
𝑭 𝑹
𝟐
= 𝑭 𝑵𝑬𝑻 𝒙
𝟐
+ 𝑭 𝑵𝑬𝑻 𝒚
𝟐
