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Newton's first law:
This states that if the force acting
on a body are in equilibrium so its
velocity will remain constant.…read more

Slide 3

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Worked example:
A submarine is moving forwards at a constant
speed of 15ms-1 and is ascending at a steady rate
of 2ms-1. choose the option that correctly
compares the magnitudes of the forces:
A) Upthrust > weight ; thrust > drag
B) Upthrust > weight ; thrust = drag
C) Upthrust = weight ; thrust > drag
D) Upthrust = weight ; thrust = drag…read more

Slide 4

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Answer:
The answer is D. the horizontal and vertical
components of velocity are constant, and
therefor the forces are in equilibrium.…read more

Slide 5

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Newton's second law:
This states that the acceleration of an object is
proportional to the resultant force and
inversely proportional to its mass.
Resultant force = mass x acceleration
Acceleration and force are both vectors so must be
acting in the same direction.
This is a variation of Newton's first law.…read more

Slide 6

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Worked example:
A motorcycle with a rider has a mass of
520kg and accelerates at 3.5ms-2.
a) If the drag is 430N, calculate the
forward driving force on the motorcycle.
b) A passenger of mass 70kg gets on the
motorcycle. What will the initial
acceleration be now…read more

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