
Newton's 3rd Law
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Science
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6th - 8th Grade
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13 Slides • 30 Questions
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Newton's 3rd Law
Sir Isaac Newton, not Fig Newton

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Sir Isaac Newton
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Sir Isaac Newton
Sir Isaac Newton (25 December 1642 – 20 March 1726/27 ) was an English mathematician, physicist,
astronomer, theologian, and author (described in his own day as a "natural philosopher") who is widely recognized as one of the most influential scientists of all time and as a key figure in the scientific revolution.
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What is Newton's 3rd Law?
Newton's 3rd Law of Motion states that, "Whenever one object exerts a force on a second object, the second object exerts equal and opposite force on the first object.
Also known as: For every action there is an equal and opposite reaction.
We call this the law of action/reaction.
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Force Pairs
The forces that two objects apply to each other.
The objects are interacting.
Action and Reaction Forces
These two forces are equal in size and opposite in direction.
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Newton's 3rd Law in space!
Watch me please!
Grab some headphones from the front lab table if you need them!
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Example: Action/Reaction
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Example: Action/Reaction
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Let's review...
The Law of Action-Reaction.
For every action there is an equal and opposite reaction.
Forces come in pairs when acting on two interacting objects.
The size of the force on one object is equal to the size of the force on a second object.
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Multiple Choice
Newton’s law states that for every action, there is an ________ reaction.
unequal and opposite
equal and similar
stronger and opposite
equal and opposite
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Multiple Choice
When a small car pushes a big truck, the truck applies an equal and opposite force on the car.
False
True
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Multiple Choice
Newton's 3rd Law of motion states that....
A object in motion/rest stays in motion/rest until it is acted upon by an unbalanced force.
Force is equal to the mass and the acceleration of an object.
For every action there is an equal and opposite reaction.
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Multiple Choice
How do forces act on an object?
They usually act alone
They act in pairs
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Multiple Choice
When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?
The cannon moving forward
The cannon moving backwards
The cannonball moving backwards
The cannonball moving forward
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Multiple Choice
Action reaction forces never cancel each other out because
They act on different objects.
They act on the same objects
They do not act on objects.
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Multiple Choice
How is this an example of Newton's Third Law?
Only the ball is applying a force to the soccer players head
Only the soccer players head is applying the force to the ball
The are both exerting an equal force on each other
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Multiple Choice
How is this an example of Newton’s Third law?
Only the ball is using the head
They are both exerting an equal force on each other
Only the head is pushing the ball
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Multiple Choice
If two people with the same mass collide, they experience the same amount of force.
True
False
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Multiple Choice
Action-reaction pairs can cause a change in motion.
True
False
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Multiple Choice
A book rests on a table. The force of gravity pulls down on the book with a force of 20 newtons. What prevents the books from accelerating downward ?
The table presses back up on the book with an equal and opposite force of 20 newtons.
The table presses back up with a force greater than 20 Newtons
The tale and the book together are accelerating downwards at 9.8 m/sec2
The inertia of the book holds it up
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Multiple Choice
When the person pushes the ground with their foot, the equal and opposite reaction force is
the ground pushing back on their foot
when they start to move forward
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Multiple Choice
Force always come in________
waves
triplets
pairs
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Multiple Choice
What is another name for Newton's 3rd Law?
The Law of Opposites Attract.
Fig Newtons.
The Law of Action-Reaction.
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Multiple Choice
When a heavy football player and a light one run into each other, who exerts more force
The light one
Their force are equal
The heavy one
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Multiple Choice
For every action there is an equal and opposite reaction.
True.
False.
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Multiple Choice
The forces in a force pair are in _______ direction
opposite
same
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Multiple Choice
For every action there is an equal and opposite reaction.
Every mass exerts a force on every other mass.
An object at rest tends to stay at rest.
Friction opposes the motion of an object.
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Multiple Choice
Because the elephants are the same size
Because they are both pulling the same amount of force in opposite directions
Because they are elephants
Because they are pulling away from each other.
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Multiple Choice
If a 10 kilogram object accelerates suddenly at 15 m/s2, how much force was applied to the object? (Hint: Use F=ma to solve.)
150 Newtons
15 Newtons
150 kilograms
100 kilograms
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Example
A swimmer pushes back on the water and moves forward.
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Multiple Choice
Which is the Action Force in this scenario: "A swimmer pushes back on the water and moves forward."
A swimmer pushes back.
A swimmer moves forward.
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Multiple Choice
Which is the Reaction Force in this scenario: "A swimmer pushes back on the water and moves forward."
A swimmer pushes back.
A swimmer moves forward.
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Multiple Choice
This picture shows .............
Newton 2nd law of motion
Newton 3rd law of motion
Newton 1st law of motion
I don't know
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Multiple Choice
What will happen if the Action is greater than the Reaction?
The man will fall
The boat will sink
Nothing will happen
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Example
A rocket blasting off from the launch pad.
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Multiple Choice
Which is the Action Force in this scenario: "A rocket blasting off from the launch pad."
A rocket blasting off from the launch pad.
The thrust of the fuel against the launch pad.
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Multiple Choice
Which is the Reaction Force in this scenario: "A rocket blasting off from the launch pad."
A rocket blasting off from the launch pad.
The thrust of the fuel against the launch pad.
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Multiple Choice
What happens to the balloon if the air is released ?
Balloon goes right
Balloon goes up
Balloon goes down
Balloon goes left
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Multiple Choice
The two paired forces in Newton's third law:
act on different objects
are equal in size
are opposite in direction
are the same type
all of the above
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Example
A fireman turns on a hose and is knocked backwards.
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Multiple Choice
Which is the Action Force in this scenario: "A fireman turns on a hose and is knocked backwards."
The force of the water from the hose.
The fireman is knocked backwards.
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Multiple Choice
Which is the Reaction Force in this scenario: "A fireman turns on a hose and is knocked backwards."
The force of the water from the hose.
The fireman is knocked backwards.
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Pick up a notecard from the front lab table.
Front side - Neatly, write 3 important pieces of information about Newton's 3rd Law.
Back side - Draw, color, and label a diagram that demonstrates Newton's 3rd Law.
Brain Dump
Newton's 3rd Law
Sir Isaac Newton, not Fig Newton

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