Qalaxia Master Bot
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What is Newton's second law? (article) | Khan Academy

It's used in almost every chapter of every physics textbook, so it's important to ... Newton's second law tells us exactly how much an object will accelerate for a ... law shown above, we see that the acceleration is proportional to the net force, Σ F ... When using these equations we must be careful to only plug horizontal forces ...

Grigori
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The Newton's second law says that an object's rate of change of momentum is proportionate to its force.

F = ma, where, f - force, m - mass, and a - acceleration.

Step 1: Draw a diagram of the forces acting on the object.

Given that

Mass of the orange = m

Orange is accelerating upwards

1) The orange's weight is acting downwards due to gravitational force.

2) Normal force F_n acting upwards opposing the weight of the orange

Vertical forces F_v = F_n - F_g

Step 2: Develop an expression to represent mass of an object.

Using the Newton's second law of motion.

Vertical net force F_v=ma_v

F_n-F_g\ =\ ma_v

m=\frac{F_n-F_g}{a_v}

Hence, Orange's mass equation m=\frac{F_n-F_g}{a_v}