Part 1
What is a force?
Force and gravity
Other forces
Forces and vectors
Part 2
Forces and equilibrium
Kinematics
Position Vectors
Constant acceleration
Part 3
Newton’s first law
Newton’s second law
Newton’s third law
Mathematical modelling
Practice tests
Practice Test Paper 1
Solution to Test Paper 1
Practice Test Paper 2
Solution to Test Paper 2
Practice Test Paper 3
Solution to Test Paper 3
Part 4
Moments
Equilibrium
Momentum and impulse
Conservation of momentum
Part 5
Conservation of energy
Variable acceleration I
Variable acceleration II
Circular Motion
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Solution 15.9a
From Mechanics
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u
=
4
u
i
v
=
2
u
j
I
=
k
mu
I
=
m
v
−
m
u
=
m
(2
u
j
)
−
m
(4
u
i
)
=
−
4
mu
i
+
2
mu
j
kmu
=
(
−
4
mu
)
2
+
(2
mu
)
2
kmu
=
20
m
2
u
2
kmu
=
m
u
20
k
=
20
=
2
5
v= 2uj
(−4mu)2+(2mu)2kmu=
20m2u2kmu=mu
20k=