Newton's Laws of Motion

Newton's First Law:

Law of Inertia

I've heard of Isaac Newton.

• Yes

• No

• Isn't that a type of cookie?

Poll

Isaac Newton is familiar to me and I may know some of his Laws of Motion...

• yes

• no

Law #1:  

An object at rest tends to remain at rest.

Law #1:  (continues)

An object in motion tends to stay in motion...

Law #1:  (continues)

at a constant velocity and in a straight line...

Law #1:  (concluded)

until it is acted upon by an unbalanced force.  

Newton's 1st Law

(Law of Inertia)

An object at rest tends to remain at rest. An object in motion tends to remain in motion at a constant velocity and in a straight line until it is acted upon by an unbalanced force.  

Multiple Select

Which completes this law: An object in motion...

• tends to remain in motion

• tends to remain in motion at a constant velocity

• tends to remain in motion at a constant velocity and in a straight line

• tends to remain in motion at a constant velocity and in a straight line until it is acted upon by an unbalanced force.

Newton's 2nd Law

F=ma

Force equals mass times acceleration.

F = ma

Multiple Choice

What is a Force?

• Something a Jedi uses

• Force is inertia.

• Force is a push or a pull.

Multiple Choice

What is mass?

• how much something weighs

• amount of atoms in an object

Multiple Choice

Acceleration is...

• speed

• m/s² or rate of change in velocity

Poll

Are you with me so far?

• Yes, keep going!

• Kind of, I'll review this Quizizz.

• I have questions and I will write them down.

• Some of this sounds familiar, but I will need your help!

SI (International System of Units)

F=ma

SI units for Force:

Newtons

SI units for mass:

kilograms

SI units for acceleration:

m/s²

REAL LIFE

• Elon Musk

• rockets

• cars

Open Ended

Engineers at SpaceX must determine the net force needed for its Starship rocket to achieve an acceleration of 70 m/s² . If the mass of the rocket is 5,000,000 kg, how much net force must the rocket develop?

Please write any ideas you may have on how to solve this. If you don't know how to solve, that's ok....write what you do know.

Consider starting here: What is the mass of the Starship Rocket?

F=ma

F = ?

m = 5,000,000 kg

a = 70 m/s²

^{First, drop all units and fill in the known variables.}

^{Second, know that numbers and letters next to each other imply multiplication.}

^{Then, multiply the numbers (ma) and this equals the Force.}

^{Last, Force is measured in Newtons.}

Show your work:

F=ma

F = ?

m = 5,000,000 kg

a = 70 m/s²

F = 5,000,000 x 70

F = 350,000,000 Newtons

Newton's 3rd Law

Action/Reaction

The action force is equal in magnitude to the reaction force and opposite in direction.

​

Example

paddle moving back =

boat moving forward

Example:

Rocket fuel = action force

Rocket propelling = reaction force

Open Ended

What is a question you still have about Newton's 3 Laws?

Open Ended

Give an example of one of Newton's 3 laws and how it relates to YOUR life or what you are interested in.