Beginner
Newton's Laws of Motion
The three rules connecting force and motion.
STEP 1 · FIRST LAW
An object stays at rest or moves uniformly unless a net force acts on it (inertia).
STEP 2 · SECOND LAW
Net force equals mass times acceleration.
STEP 3 · THIRD LAW
Every action has an equal and opposite reaction.
WORKED EXAMPLE
A 1,000 kg car accelerating at 2 m/s² needs a net force of 2,000 N.
Formulas
Second law
F = m a
F newtons, m kg, a m/s²
Momentum
p = m v
Weight
W = m g
g = 9.81 m/s²
Practice questions
Q1.Inertia is described by Newton's…
Newton's Laws of Motion · Easy
Q2.Weight of a 10 kg mass (g = 9.81)?
Newton's Laws of Motion · Easy
Q3.Rocket propulsion is best explained by…
Newton's Laws of Motion · Medium