1. Vectors and scalars

2. Demonstrate an understanding of the difference between scalars and vectors and give common examples
Add vectors by graphical representation to determine a resultant
Determine graphically the resultant of two vectors

3. For your notes Define vector and scalar quantities
Give examples of each
Add and subtract vectors

4. Scalar quantities only have magnitude (size)
Scalars
Scalar quantities only have magnitude (size)
e.g. temperature, speed, distance, energy, mass.

5. Vectors are quantities with magnitude and direction.
In pairs develop a list of vector and scalar quantities
Which values can be negative? What about temp?

6. Drawing vectors Well duh Use arrows
Length of arrow represents magnitude of vector
Direction represents direction of vector
Well duh

7. An illustrative example
Speed vs velocity
Consider a car travelling in a circle at a constant speed of 2ms-1
Comment in as much detail as possible on
The speed
The velocity
The acceleration

8. Speed vs Velocity

9. Firing a bullet from a Plane
A plane flys at 610 ms-1 it shoots a bullet at 600ms-1.
Does it shoot itself down?
What is the velocity of the bullet?

10. Adding vectors Draw a diagram like this in your books.
E.g. Scale: 1 cm = 2 cm s-1
the magnitude of P can be calculated using Pythagoras’ theorem:
P2 = vh2 + vv2 P Vh Vv

11. Parallelogram of vectors
Draw both vectors from the same point
Complete the parallelogram
The diagonal is the resultant
Measure the length (magnitude )and angle

12. Also
You can use a parallelogram drawn to scale to find the components of a force.
The most useful components are perpendicular

13. Notes
P46-7 Answer all questions.

14. Summary questions Define a vector and a scalar
Give 5 examples of scalar quantities
Give 5 examples of vector quantities
Draw a scale diagram to add a force of 3N at 30º to the horizontal to a force of 5N at 80º to the horizontal
Resolve an acceleration of 2ms-2 at an angle of 25º from North into two perpendicular vectors.

15. Can you? Define vector and scalar quantities Give examples of each
Add and subtract vectors