Newton's Laws of Motion

Newton's Laws of Motion

What is Inertia?

Inertia is the tendency for something to resist moving when it is at rest or something to resist stopping when it is moving.

A great example is when the car suddenly slows down, the passengers lean forward, resisting the stopping motion. 

You also feel this force when a vehicle suddenly takes off and you are jerked backwards a bit. You didn’t want to move but eventually the car overcame your inertia and you began to move with the car.

Newton's First Law

Newton's first law of motion is also known as the Law of Inertia.

Newton's First law states that:

A. An object at REST, will stay at REST unless an unbalanced force acts on that object

B. An object that is MOVING will keep MOVING unless an unbalanced force acts on that object

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Question:

When Traveling in a car and turning right, which way does your body go and why?

Answer:

Subject | Subject

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​The car is beneath you, propelling you forward. When the car moves to the right, your body continues straight but feels like you are pushed to the left. We compensate this feeling by leaning our bodies to the right. Sometimes if the curve is sharp enough, you might feel yourself pressed to the left a lot more, your seatbelt holding onto you or the door protecting you.

Technically, your body will continue straight but it feels like you are being pulled to the other side of the curve.

Newton's Second Law

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​Newton’s Second Law of motion is also known as the Law of Acceleration.

It states that: An unbalanced force upon an object causes it to accelerate.

The formula is F=m*a (f is force, m is mass, and a is acceleration)

The greater the force that is applied, the greater the acceleration.
The lesser the force that is applied, the less the acceleration.
If the same force is applied to an object with a large mass, it will have a smaller acceleration.
If the same force is applied to an object with a small mass, it will have a larger acceleration.

Newton's Third Law

Newton’s Third Law is also known as the Law of Action/Reaction.

Newton’s Third Law says that:

Every time there is an action force, there is also a reaction force that is equal in size  and acts in the opposite direction.

Newton’s Third Law states that forces must ALWAYS occur in PAIRS.

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Multiple Choice

What is Newton's First Law of Motion?

• Every action has an equal and opposit reaction

• Objects in motion stay in motion/Objects at rest stay at rest until an outside force acts on it

• A force is required to accelerate an object with a known mass

Multiple Choice

What is Newton's Second Law of Motion?

• Every action has an equal and opposite reaction

• Objects in motion stay in motion/objects at rest stay at rest until an outside force acts on it

• A force is required to accelerate an object with a known mass

Multiple Choice

What is Newton's Third Law of Motion?

• Every action has an equal and opposite reaction

• Objects in motion stay in motion/objects at rest stay at rest until an outside force acts on it

• A force is required to accelerate an object with a known mass

Other Forces

Gravity: the universal force of attraction acting between all matter.

Gravity is a constant force that objects on Earth undergo. 

If a vase is pushed off a table, it will not continue in a straight line, it would eventually be overcome by the force of gravity and fall to the ground.

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Other Forces

Friction: the resistance that one surface or object encounters when moving over another.

​Friction happens between two objects, usually going in opposite directions. Think of sliding, the smoother the surface the farther you will slide. The rougher the surface, you won’t slide as far. Friction is pushing against objects, slowing them down. Even in the air, friction is fighting against the gas particles, which will eventually slow them down (it also fights gravity in the air). Friction also is the reason you can walk on most surfaces. Think if everywhere was slippery like ice!

Multiple Choice

A frog pushes his legs down on a lily pad, but yet the direction he travels is upwards. Which law explains this?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

Multiple Choice

The Swimmer moves her hand down and to the left and her body moves forward and to the right

• Newton's first law

• Newton's Second Law

• Newton's Third Law

Multiple Choice

A person in a car slides to the right when going through a very sharp left turn on the highway

• Newton's First Law

• Newton's Second Law

• Newton's Third Law