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Get Started Now- Intro Lesson5:22
- Lesson: 1a2:39
- Lesson: 1b5:35
- Lesson: 1c6:04

In this lesson, we will learn:

__Notes:__

**Newton's Second Law**

- Newton's second law of motion
- Problem solving with Newton's second law of motion

__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 $\vec{F}_{net}=ma$- The force of gravity acting on an object is $\vec{F}_{g}=mg$, where $g$ is acceleration due to gravity (9.81 m/s2 [down])

$\Sigma \vec{F} = \vec{F}_{net} = m\vec{a}$

$\Sigma \vec{F}:$ sum of all forces, in newtons (N)

$\vec{F}_{net}:$ net force, in newtons (N)

$m:$ mass, in kilograms (kg)

$\vec{a}:$ acceleration, in meters per second squared $(m/s^{2})$

- IntroductionIntroduction to Newton's second law

$\cdot$Meaning of Newton's second law

$\cdot$Newton's second law formula

$\cdot$Newton, the unit of force - 1.
**Applying Newton's second law**a)What is the unbalanced force required to accelerate a 1370 kg car at 4.25 $m/s^{2}$?b)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?c)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 $m/s^{2}$, find the force of air resistance acting on the apple.