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Physics Term 1 Yr9 Cheat Sheet (DRAFT) by

Physics Year 9 IGCSE Term 1

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Speed and distance time graphs

Speed:
Interp­reting a distan­ce-time graph:
to calculate speed we need to know the distance travelled and the time taken
Distance time graphs show us the relati­onship between the distance travelled and the time taken to cover it.
avg speed= total distance (m) ÷ total time (s)
A straight flat line means the object is at rest beacause distance is not increasing and time is simply moving on.
speed= distance ÷ time (s=d/t)
A steeper slope would imply accele­ration if it is increasing and deacce­lar­ation if it is decreasing
 
We can interpret a straight line as steady speed
At any point in the graph you can find the speed by finding the slope as you would for any other graph

Mass, Weight and Fields

What is mass?
what is weight?
Mass is a measure of much matter there is in an object.
Weight is a measure of the effect of gravity onan object.
How to calculate mass:
How to calculate weight:
 
W=mg

Gravit­ational field strength

what is gravit­ational field strength?
A gravit­ational field is a region where a mass experi­ences a force, gravit­ational field strength is a measure of the strength of that field
gravit­ational field strength is measured in (N/Kg) newtons per Kg
How to find gravit­ational field strength:
Gravit­ational field strength is calculated using the formula g = GM/r², where G is the gravit­ational constant, M is the mass, and r is the distance.
     

Straight line graphs

what is the equation of a straight line graph?
y=mx
the equation linking weight mass and gravit­ational field strength is:
W=mg , (weight= mass x gravit­ational field strength)