Form 4 Physics: Unit Conversion 1

To master the unit conversion questions my advice is u need to polish your maths basic skills such as conversion & standard form. But in physics,..by now u should already memorised the power of 10 for all the prefixes in Physics like Mega, Giga, kilo, micro & etc.
For example:
Mega = M = 10⁶
kilo = k = 10³

Here some working examples of unit Conversion :
1. 5 kg = 5 (k)g
= 5 (10³ )g
= 5 x 10³ g
( coz k is the prefix for 10³, so just substitute the value of k with 10³)

2. Lets change the unit from km/hr to m/s

7200 kmhr^-2

= 7200 km / hr²

= 7200 x 10³ m

-------- ----

( 60 x 60)² s²

= 5.6 x 10 ^-1 ms^-2

On next example i'll show u step by step how unit m³ is changed to cm³

4. 125 cm³, lets change the unit to m³

125 cm³ = 125( 1cm x 1cm x 1cm ), now we wanna change the unit cm to m,

coz prefix centi (c) means, c=10^-2,so we subst symbol c with 10^-2

= 125( 10^-2m x 10^-2m x 10^-2m)

= 125( 10^-2 x 10^-2x 10^-2) (m)³ see, the unit now changed to metre cube :)

= 125(10^-2) m³

=125 x 10^-6 m³

We can also rewrite it in standard form ,1.25 x 10^-4 m³

Happy learning!!!!