Upcoming SlideShare
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Standard text messaging rates apply

# Physical quantities and units pps

3,520
views

Published on

Cambridge As/A level Physics …

Cambridge As/A level Physics
prepared by Ferry Tanoto
for Central International School students.

1 Like
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

Views
Total Views
3,520
On Slideshare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
177
0
Likes
1
Embeds 0
No embeds

No notes for slide

### Transcript

• 1. Physical Quantities and Units
As/A Level Physics @ferrytanoto
• 2. Physical Quantity
Is a feature of something which can be measured, e.g. length, weight, or time of fall.
Every physical quantity has a numerical value (magnitude) and a unit,
e.g. 25 m is the physical quantity of length; 25 is the magnitude and metre is the unit.
• 3. Prefix
• 4. Unit Conversion for Areas and Volumes
Length
1 mm = 10-3m
Areas
Squaring both sides 1 mm2 = (10-3)2 m2 = 10-6 m2
Volume
Cubing both sides 1 mm3 = (10-3)3 m3 = 10-9 m3
• 5. Base Units
• 6. Derived Units consists of some combination of the base units. The base units may be multiplied together or divided by one another, but never added or subtracted
• 7. Derived Units
• 8. In any equation where each term has the same base units, the equation is said to be homogeneous or ‘balanced’.
• 9. A quantity which can be described fully by giving its magnitudeis known as a scalar quantity. A vector quantity has magnitudeand direction.
• 10. Scalar and Vector Quantities
• 11. Vector Representation
One way to represent a vector is by means of an arrow. The directionof the arrow is the directionof the vector quantity. The lengthof the arrow, drawn to scale, represents its magnitude.
The combined effect of two (or more) vectors is called the resultant.
Coplanar (all in the same plane) vectors may be added (or subtracted) using a vector diagram.
The resultant may be found using a scale drawing of the vector diagram of by calculation.
• 13. Resolution of Vectors
A single vector may be divided into two separate components.
The dividing of a vector into components is known as the resolution of the vector.
In general, a vector is resolved into two components at right-angles to each other.
• 14. Sine rule
• 15. Cosine rule
• 16. Pythagoras’ Theorem