AQA A-Level Physics Summary - Newton's Laws

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Newton’s laws of motion
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Last edited time @October 1, 2023 9:11 AM



Newton’s laws of motion
NUMBER STATEMENT EQUATION CONSEQUENCE

A body will remain
at rest, or continue
INERTIA = the
moving at a
reluctance of a
I constant velocity, ∑ F = 0, ΔV = 0 
massive body to
unless a non-zero
change its motion.
resultant force acts
on it.
Δρ
The rate of change Δt
​ α∑F F = ma [k ≡
of a body’s 1 kgms−2 ≡ 1N ]
momentum is or
II
proportional to the
resultant force F = Δρ
Δt

​ F = Δρ Δmv
Δt = Δt =
​ ​




acting on it. m Δv
Δt
= ma
​




If body A exerts a
force on body B,
then body B will
exert on body A a
III A FB =B (−F )A 
force that is equal in
​ ​ ​ ​




magnitude and
opposite in
direction.


Newton’s third law.

A FB
​ ​ =B (−F )A
​ ​

eArth FB ox
​ ​ =B ox (−F )eArth
​ ​




Newton’s laws of motion 1