Summary COMPLETE PHYSICS PAPER 2 NOTES (GRADES 1-9)

(AQA GCSE) PHYSICS PAPER 2 NOTES

, FORCES



Forces: Basics and Newton9s Laws

Forces Basics :

and Newton s 9

Laws :

A force is a push or pull that can
change the motion or shape of an
object. Forces are measured in
newtons (N). One newton is the force
needed to make a 1 kg mass accelerate
by 1 m/s².


Newton s First Law9

Law of Inertia
( )

An object will stay at rest or continue
moving at a constant velocity unless a
resultant force acts on it.

If the forces are balanced, the
motion doesn9t change.
If the forces are unbalanced, the
object will accelerate.


Newton s Second 9

Law
The acceleration of an object depends
on the resultant force and its mass.

F = ma

A bigger force ³ bigger
acceleration.
A bigger mass ³ smaller
acceleration for the same force.

AQA often asks about resultant force,
so emphasise:
Resultant force=sum of all forces acting
on the object




Remember, weight is a force! Weight = mass × gravitational field strength (W = mg). On Earth, the gravitational
field strength (g) is approximately 9.8 N/kg.