2.2 Nature Of Quantities Flashcards
1
Q
What is a scalar quantity?
A
- has magnitude but not direction
2
Q
What is a vector quantity?
A
- has magnitude and direction
3
Q
Scalar quantity examples?
A
- mass
- density
- volume
- distance
- speed
- energy
- power
4
Q
Vector quantity examples?
A
- weight
- pressure
- impulse
- displacement
- velocity
- acceleration
- momentum
5
Q
What is displacement?
A
-the distance moved by an object in a particular direction
6
Q
What is a vector triangle?
A
- type of scale diagram with two vectors, to show how they can be added together
7
Q
What is a resultant vector?
A
- the sum of the two vectors in a vector triangle that forms the third side.
8
Q
How do you find the magnitude of the resultant vector?
A
- pythagoras
9
Q
How do you determine the direction of the resultant vector?
A
- trigonometry
10
Q
How do you find magnitude and direction of resultant vector not in a right angled triangle?
A
- draw scale drawing and measure length and angle
11
Q
What is resolving a vector?
A
- separating the vector triangle into two components, horizontal and vertical
12
Q
Why do horizontal and vertical components not affect each other?
A
- the angle between them is 90degrees and cos(90) = 0 so value of horizontal is 0 when we consider vertical
