Newton's First and Second Law

Newton's Second Law of Motion

By Leah Lecerio

Newton's laws of motion generally imply the relationship between an object's motion and the forces acting on it.

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Newton's Laws of Motion

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Newton's Laws of Motion

• Newton's First Law: Law of Inertia

• Newton's Second Law: Law of Acceleration

• Newton's Third Law​: Law of Interaction

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Learning Targets

• I can identify the statements that agree with Newton’s Second Law of Motion.

• I can calculate for the unknown variable for a given problem on Newton’s Second Law of Motion.

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​Let's LEARN a little Physics :)

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​https://www.youtube.com/watch?v=xzA6IBWUEDE

​Mathematical:

https://www.youtube.com/watch?v=8YhYqN9BwB4​

Conceptual:​

Learning Materials

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PRACTICE TIME!​

Let's see how you're doing so far :)​

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Multiple Choice

Which of the following variables has an inverse relationship with acceleration?

• mass

• net force

• none of these two

Multiple Choice

Which of the following variables has a direct relationship with acceleration?

• mass

• net force

• none of these two

Multiple Choice

Which of the following statements is in agreement with Newton’s Second Law?

• Decreasing the mass of an object by half will decrease its acceleration by half, if force is kept constant.

• At constant mass, doubling the magnitude of net force acting on an object will double its acceleration.

• At constant mass, decreasing the net force on an object into ¼ of the original value will quadruple the acceleration.

Multiple Choice

Which of the following equations can allow us to solve for the acceleration when the net force and mass are known?

• a = F/m

• a = F⋅m

• a = m/F

Multiple Choice

Which of the following are the correct units for mass and acceleration for “Newton” to come out as the unit for force?

• g & m/s²

• kg & km/h²

• kg & m/s²

Multiple Choice

How much force is required to accelerate a 5 kg object by 8 m/s²?

• 0.625 N

• 1.6 N

• 40 N

Multiple Choice

What is the resulting acceleration if a 4-N force acts on a 2-kg object?

• 0.5 m/s²

• 2 m/s²

• 8 m/s²

Multiple Choice

An object accelerates at 7 m/s² when a 21-N force is applied to it. What is the mass of the object?

• 0.33 kg

• 3 kg

• 147 kg

Multiple Choice

A 6-N force is applied on a 2400-g object. What is the resulting acceleration of the object?

• 0.0025 m/s²

• 2.5 m/s²

• 400 m/s²

​ΣF = ma

where:

F = net force (SI unit: N)

m = mass of the object​ (SI unit: kg)

a = acceleration of the object (SI unit: m/s²)​

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The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.​

Summary: Newton's Second Law

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​A NEWTONIAN CHECK:

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Now here is the ultimate test :)​

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Multiple Choice

Which of the following correctly describes how mass and net force are related to an object’s acceleration?

• Acceleration is directly related both to the object’s mass and to the net force acting on the object.

• Acceleration is inversely related both to the object’s mass and to the net force acting on the object.

• Acceleration is inversely related to mass, and directly related to net force.

Multiple Choice

Which of the following statements is consistent with Newton’s Second Law of Motion?

• Adding more load into a grocery cart will decrease its acceleration if net force is kept constant.

• Increasing the net force on an object will never affect its acceleration.

• Increasing the mass and net force at the same factor will change the acceleration.

Multiple Choice

Which of the following equations can allow us to solve for the mass of an object when the net force acting and the acceleration are known?

• m = a/F

• m = F⋅a

• m = F/a

Multiple Choice

Which of the following is the SI unit for force?

• Pascal

• Newton

• Joule

Multiple Choice

In accordance with Newton’s Second Law, what will happen to the acceleration of an object if the object’s mass is decreased by 1/3, and net force is held constant?

• The acceleration will be tripled.

• The acceleration will become 1/3 of  its original value.

• The acceleration will remain unchanged.

Multiple Choice

If we apply a constant force of 120 N on a 10 kg object located on a frictionless surface, what is the acceleration of the object?

• 0.08 m/s²

• 12 m/s²

• 1200 m/s²

Multiple Choice

What is the net force on a dragster with a mass of 900 kg if its acceleration is 30 m/s²?

• 0.03 N

• 30 N

• 27,000 N

Multiple Choice

A car pulled by a tow truck has an acceleration of 2 m/s². What is the mass of the car if the net force on it is 2600 N?

• 1300 kg

• 2600 kg

• 5200 kg

Multiple Choice

At the time of its launch, the Titanic was the most massive mobile object ever built, with a mass of 6.0×10⁷ kg. If a force of 6 MN (6×10⁶N) was applied to the ship, what acceleration would it experience?

• 1 x 10^-7 m/s²

• 0.1 m/s²

• 10 m/s²

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How well did you do?

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Poll

Choose the statement that best describes how well you have attained the learning target:

I can identify the statements that agree with Newton’s Second Law of Motion.

• 😎 I think I have totally achieved the learning target!

• 🙂 I somewhat achieved the learning target, but I may need a little assistance with some concepts.

• 🙁I don't think I have achieved the learning target. I need more help.

Poll

Choose the statement that best describes how well you have attained the learning target:

I can calculate for the unknown variable for a given problem on Newton’s Second Law of Motion.

• 😎 I think I have totally achieved the learning target!

• 🙂 I somewhat achieved the learning target, but I may need a little assistance with some problem solving steps.

• 🙁I don't think I have achieved the learning target. I need more help.