Newton's 3rd Law

On the next slide, read the article and answer the following questions.

Multiple Choice

For every_______there is an equal and ________ reaction.

• motion, opposite

• action, opposite

• action, unequal

• motion, unequal

Multiple Choice

How do fish propel forward in water?

• 1. Water pushes back twice as hard as the fin pushing on it.

• 1. Air bubbles under the fins

• 1. The water pushes back on the fins with an equal force.

• 1. A fish pushes the water harder than the water can push back.

Multiple Choice

Which of the following situations is an example of Newton’s 3rd Law?

• 1. To jump off the ground, your legs push down on the Earth, and it pushes you back.

• 1. During a game of baseball, a pitched ball stays in motion until it connects with the bat and changes directions.

• 1. A 250-pound linebacker exerts more force tackling the quarterback than a 150-pound player would.

Multiple Choice

How is this an example of Newtons 3^rd law?

• Only the ball is using the head

• Only the head is pushing the ball

• They are both exerting an equal force on each other

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• watch the video

• then answer the following questions

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Multiple Choice

Every time your cat’s paw hits her toy string, it swings away from her. How does this demonstrate Newton’s third law of motion?

• 
  
  Objects with mass, such as your cat's paw and toy string will require inertia

• objects in action, such as the string toy will experience force

• for every motion from your cat's paw, the is an unbalanced inertia from the string

• for every action your cat makes, there is an equal and opposite reaction from the string.

Multiple Choice

What happens when two objects, such as a baseball and a bat, collide?

• one remains still while the other one moves in the same direction

• They hit each other with the same force in opposite direction.

• They hit each other with unequal force in opposite direction

• they hit each other with the same force in same direction

Multiple Choice

What does an object do when it accelerates?

• It speeds up

• it moves in the opposite direction

• It changes speed and direction

• all of the above

Multiple Choice

What determines an objects mass?

• Amount of matter

• Amount of Friction

• Amount of Force

• Amount of gravity

Multiple Choice

When two objects with unequal mass collide, what will they do?

• Accelerate at different rates

• Accelerate in the same direction

• Come to a complete stop

• continue at the same velocity

Multiple Choice

A softball and a volleyball collide with equal speed, and then they accelerate at the same rate. What must be true about the masses of the objects?

• The softball has more mass than the volleyball

• The softball and the volley ball has equal masses.

• The volleyball has more mass than the softball

• it is impossible to compare the masses of the softball and the volleyball

Fill in the Blank

If you were to push on a brick wall with 100 N of force, how much force would the wall push back toward you?

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• Read through the information on the website.

• Answer the following questions

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Multiple Choice

David pushes the wall to the left with his finger. The wall pushes David to the right. What is the action force?

• force of finger on the wall

• force of wall on the finger

• The is no action reaction force

Multiple Choice

David pushes the wall to the left with his finger. The wall pushes David to the right. What is the reaction force?

• force of finger on the wall

• force of wall on the finger

• The is no action reaction force

Multiple Choice

When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

• The cannon moving forward

• the cannonball moving backwards

• the cannon moving backwards

• The cannonball moving forward

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 tale and the book together are accelerating downwards at 9.8 m/sec2

• The table presses back up with a force greater than 20 Newtons

• The inertia of the book holds it up

Multiple Choice

When Ronda Rousey got kicked in the face, What is the interaction pair?

• The foot and the face

• The foot and the air flow

• Ronda Rousey and media criticism 

• Ronda Rousey on the floor

Poll

How do we feel about Newton's Third Law of Motion?

• I'm feeling great, because I'm a pro

• I'm a little confused but I think I pretty much have it figured out

• I'm lost... point blank period

• What class is this?