# Biology

## Biology

• Submitted By: Yi-Jia
• Date Submitted: 06/17/2016 8:27 PM
• Category: Science
• Words: 3051
• Page: 13

SPM Revision Notes
PHYSICS: Topics 1 to 5
Mechanics, Heat and Light

Units
Base Quantity

SI Unit

Symbol

Mass, m

kilogram

Kg

Length, l

meter

m

Time, t

second

s

Temperature, T

kelvin

K

Current, I

ampere

A

Prefix

Value

Symbol

Example

giga

× 109

G

gigawat

Symbol for
example
GW

mega

× 106

M

megawat

MW

kilo

× 103

k

kilometer

km

deci

× 10-1

d

decimeter

dm

cent

× 10-2

c

centmeter

cm

milli

× 10-3

m

millimeter

mm

micro

× 10-6

μ

micrometer

μm

Scalar and Vector Quanttes
• Scalar quanttes are physical quanttes with only
magnitude.
• Vector quanttes are physical quanttes having both
magnitude and directon.
Scalar Quantities

Vector Quantities

Distance

Displacement

Speed

Velocity

Mass

Weight

Energy

Momentum

Temperature

Pressure

Time

Acceleraton

Power

Force

Density

Impulse

Force and Moton
change of distance
speed 
time taken
total distance travelled
average speed 
total time taken
change in velocity v  u
acceleration, a 

time taken
t

Equatons of Linear Moton with Uniform
Acceleraton
 u v 
s 
t
 2 
v u  at
1 2
s ut  at
2
v 2 u 2  2as
s : displacement
u : initial velocity v : final velocity
t : time taken

a : acceleration

Newton’s Laws
• 1st Law of moton: (Law of inerta)
– Every object will contnue in its state of moton with uniform
velocity or at rest unless it is acted upon by an external force.

• 2nd Law of moton:
– If an external resultant force acts on the object, it will produce
a change in moton (called acceleraton) which is proportonal
to the force and inversely proportonal to the mass of the
object, ie. F = ma

• 3rd Law of moton:
– For every acton (force), there is an equal and opposite
reacton (force).

Momentum
• Momentum is the product of mass and
velocity, p =...