Intro to Newton's Laws

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Newton’s Laws
of Motion

Presented by Kesler Science

Vers. 08/2020

© Kesler Science, LLC

Newton’s Laws of Motion

Essential Questions:

Reflect on the Essential
Questions before you dive in…

1. If you were quizzed today,
which questions would you know
the answers to already?

2. Which questions would you
need to learn more about to
answer confidently?

1.

What are Newton's
Laws of Motion?

2.

How do Newton's Laws
of Motion apply to
sports activities,
amusement park rides,
Earth’s tectonic forces,
and rocket launches?

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Newton’s Laws of Motion

Force
•A push or a pull on an object
•Causes a change in the motion of
an object
•An object’s mass multiplied by
acceleration (F=m x a)
•Measured in Newtons (N)

What unit is force

measured in?

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Newton’s Laws of Motion

Balanced Force
•Two forces acting in opposite
directions on an object, and
equal in size
•Object stays still or continues
moving at the same speed and
in the same direction

10N

12N

12N

10N

Why are these forces balanced?

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Newton’s Laws of Motion

Unbalanced Forces
•Causes a change in motion of an
object

•Causes acceleration

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Newton’s Laws of Motion
Net Force
•The combination
of all forces on
an object
•Measured in
Newtons (N)

14N

10N

Net Force = 4N
How could you make the forces on

the right balanced?

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Newton’s Laws of Motion

Friction
•The force that causes a moving
object to slow down when it
touches another object
•One object rubbing against
another

Since friction is a force,

what unit is friction

measured in?

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Newton’s Laws of Motion

Speed
•Speed is a way of measuring
how quickly something is moving
or being done

•Ex. - A motorcycle going 55
miles per hour

•Ex. – Sweeping the floor for 5
minutes

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Newton’s Laws of Motion

Velocity
The rate at which an
object changes
position in a specific
direction

Ex: 35mph west

How are speed and
velocity different?

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Newton’s Laws of Motion

Acceleration
The rate at which an object
changes its speed or direction
(speeding up, slowing down, or
changing direction)

Ex.1 – Downhill
on a rollercoaster

Ex.2 – Uphill on a
rollercoaster

Ex.3 - Turning a
corner even if
your speed stays
the same

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Newton’s Laws of Motion

Applied Force
A force that is applied to an
object by a person or another
object

Ex. – A person pushing a box up
a ramp
Ex. – A bulldozer moving dirt

What are the three times

acceleration happens?

Think About It

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Design a safety restraint or device for a

motorcycle, 4-wheeler, or go-kart.

Designs may be drawn or described. Be
sure to explain how your devices protects

the driver against collision forces.

Motorcycle

Go-kart

4-wheeler

Multiple Choice

A push or pull on an object is called a ____.

• Newton

• Force

• Acceleration

• Friction

Multiple Choice

Force is measured in ____

• kilgrams

• grams

• Newtons

• Watts

Multiple Choice

Balanced force cause ____

• objects to change their motion

• objects to remain at rest

• objects to change their speed

• objects to change their direction

Multiple Choice

Unbalanced forces cause____.

• acceleration

• objects to remain at rest

• objects to stay at the same speed

Multiple Choice

What is the net force?

• 300 N

• 0 N

• 600 N

• 150 N

Multiple Choice

What is the net force on the airplane?

• 900 N to the right

• 700 N to the right

• 700 N to the left

• 780 N to the right

Multiple Choice

The difference between speed and velocity is ____.

• speed is measured in mph

• velocity is measured in mph

• velocity has a direction

• a trick question: they are the same

Draw

Draw a safety restraint system for a 4 wheeler, go kart, or motorcycle that protects the driver during collisions.