Topic 1: Key Comcepts Of Physics Flashcards
What is a significant figure
The number of none-zero figures after a decimal point or previous number
What is a unit prefix?
What are the unit prefixes for:
Nano, micro, milli, centi, kilo, mega and giga
A unit prefix is the unit multiples and submultiples
n= /1,000,000,000
m= /1,000,000
milli (u)= /1,000
c= /100
k= x 1,000
M= x1,000,000
g= x 1,000,000,000
What is standard form
When large values maybe written as x10 to a power
Eg. x1,000= x10^3
Equation for distance
Distance= speed x time
Equation for acceleration
a= v-u/t
Equation for force
F=ma
Equation for weight
Weight= mg
Equation for GPE
GPE= mgh
Equation for KE
KE= 0.5mv^2
Equation for efficiency
Efficiency= useful energy out/ total energy in x100
Equation for wave speed
Wave speed= v= x/t
Equation for work done/ energy
Work done= force x distance (moved in the direction of force)
E= fd
Equation for power
Power= work dome/ time= energy transfered/ time taken
Equation for moment of force
Mkment of force= force x perpendicular distance
Equation for energy transferred
Energy transferred= charge moved x pd= E= QV
