Newton’s Third Law – Tier 2

Part 1: Hitting a Table and Playing with Exercise Balls

What force caused your fist to stop moving? What object applied that force?

Draw arrows on the picture below to represent the forces involved.

What force acted on the girl? What force acted on the boy?

How were the results similar? How were the results different?

Part 2: Balloon Rockets

What is propelling the balloon forward? Try to explain using your knowledge of forces.

Part 3: Balloon Rockets Explanation

1.  Each of these arrows represents a force in an action reaction pair.

Which object is applying the force being represented by the dashed arrow?

(Hint: What is inside the balloon that is invisible?)

2.  What object is its force being applied to?

3.  Now write the action force for the dashed arrow on the lines below based on your responses to the previous 2 questions.

Force of ______on______.

4.  Now write the reaction force for the solid arrow on the lines below.

Force of ______on______.

5.  On the diagram below identify the action reaction forces on the lines provided

6.  How can we tell if the bucket will move? To do this we need to look at only the forces on the bucket. This will allow us to evaluate the net force on the bucket.

What is the net force on the bucket (include the direction)? So which direction will it move in this situation?

7.  Now go back to the balloon example. Explain what happens when the end of the balloon is open and air is escaping; what causes the balloon to move?

Part 4: Identifying Action - Reaction Pairs

Explain the action and reaction forces present in the following items pictured on the front of the poster:

a)  The dolphins swimming in the water

b)  The rocket flying up through the air

c)  The woman pushing the shopping cart

d)  The hammer hitting the nail

Part 5: Newton’s Third Law – Balloon Racers

What is the action force in this investigation?

What is the reaction force in this investigation?

What is the action force acting on in this investigation?

What is the reaction force acting on in this investigation?