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Action Reaction Pairs
Newton's 3rd Law
Systems
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THIS IS NOT A CATEGORY
100
Identify and sketch the action-reaction pair: Book sitting on a desk.
Book pushes desk, desk pushes book.
100
What is Newton's 3rd Law? Answer in one sentence.
Every action has an equal and opposite reaction.
100
Sketch the following a book on a desk being pulled horizontally by a string by a person's hand. Sketch a system containing the book only.
Systems are shown by dotted lines in a sketch. BONUS POINTS: What force is causing the system to accelerate?
100
Forces always occur... A. by themselves B. in pairs C. Some appear in pairs, some do not
B. in pairs. (Newton's 3rd Law)
100
This is not a question. You cannot earn points by answering it.
GOOD JOB!! 0 points to your team!
200
Identify and sketch the action-reaction pair: Baseball bat hits a ball.
Bat hits ball, ball hits bat.
200
What happens when one object exerts a force on a second object?
The second object exerts an equal and opposite force on the first object.
200
What kind forces are important when trying to find the acceleration of a system?
External Forces
200
TRUE OR FALSE: You are riding your bike and crash directly into a parked car. The force of impact is greater on your bike.
False
200
Why did you pick this category?
I have no idea.
300
Identify and sketch the action-reaction pair: Skydiver falling to earth. (ignore air resistance)
earth pulls skydiver, skydiver pulls earth.
300
Which of the following is NOT an action reaction pair? A. bat on ball, ball on bat B. horse on cart, cart on horse C. earth on apple, hand on apple D. book on face, face on book
C. earth on apple, hand on apple. BONUS POINTS: Why is this not an action-reaction pair?
300
How can you identify external forces in a diagram of a system?
Force arrows that cross the dotted line boundary of the system are external forces.
300
You get on the red line at 87th heading north. How many stops until you reach 47th?
4. http://www.transitchicago.com/redline/
300
Can you not?
...
400
Identify and sketch the action-reaction pair: A student walking down the hallway.
Feet push floor, floor pushes feet.
400
When a cannon fires a cannonball, why does the cannonball accelerate so much more than the cannon when the forces are equal and opposite?
The cannon has a much larger mass than the cannonball, so its acceleration must be smaller in order to keep the forces equal and opposite.
400
Define a system in physics.
A collection of objects that you choose to focus on in a physics problem or situation. Indicated by a dotted line in a diagram.
400
Who is taller, Drake or Lil Wayne?
Drake https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8&safe=active&ssui=on#q=lil+wayne+height&safe=active&ssui=on
400
I'm so glad you are making good use of the in class review time.
smh
500
Identify and sketch the action-reaction pair: Rocket propelling itself through space.
Rocket pushes exhaust gasses, gasses push rocket.
500
If the earth pulls you down against a chair, what is the reaction force?
You pull the earth up.
500
How does the horse cart system accelerate?
The ground applies an external force on the horse, which is greater than the force of the cart pulling back on the force, so the system accelerates.
500
What is the smallest amount of coins (quarter, dime, nickel, penny) that you could use to make exact change for every value between $.01 and $0.99?
10 coins: 3 Quarters, 1 dime, 2 nickels, and 4 pennies.
500
NO. STOP IT. STOP.
NO.