Newton's second law of motion
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- Applying Newton's second law
- What is the unbalanced force required to accelerate a 1370 kg car at 4.25 m/s2?
- What is the unbalanced force required to bring a 995 kg car travelling at 11.5 m/s to a stop in 30.0 m?
- An apple falls from a tree.
i. What is the force of gravity acting on a falling 0.200 kg apple?
ii. If the apple is accelerated downwards at 9.53 m/s2, find the force of air resistance acting on the apple.
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Topic Notes
In this lesson, we will learn:
Notes:
- Newton's second law of motion
- Problem solving with Newton's second law of motion
Notes:
- Newton's second law: If a net force acts on an object, its velocity changes. The acceleration is proportional to the magnitude of the net force, and inversely proportional to the mass, or Fnet=ma
- The force of gravity acting on an object is Fg=mg, where g is acceleration due to gravity (9.81 m/s2 [down])
ΣF=Fnet=ma
ΣF: sum of all forces, in newtons (N)
Fnet: net force, in newtons (N)
m: mass, in kilograms (kg)
a: acceleration, in meters per second squared (m/s2)
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