Monday December 12, 2011
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Transcript of Monday December 12, 2011
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Monday December 12, 2011
Warm Up
Projectile motion describes
the curved path all objects follow on the surface of Earth that results from vertical and horizontal acceleration
b. the straight path all objects follow on the surface of Earth that results from vertical and horizontal acceleration
c. the curved path all objects follow on the surface of Earth that results from vertical acceleration only
d. the curved path all objects follow on the surface of Earth
that results from horizontal acceleration only
Classwork
#57 Momentum Notes#58 Momentum Calculations
Homework
Complete #56
Test: Friday
#57 Momentum Notes
Momentum a mass with a velocity. Basically any moving mass. The
more mass the more momentumThe more velocity the more momentum
Objects with a lot of momentum require a larger unbalanced force
to stop them
The Law of Conservation of Momentum when objects collide the
total amount of momentum stays the sameEX: a cue ball shot at an 8
ball, the momentum of the cue ball is transferred directly to the 8
ball. EX2: Newtons CradleWhen objects stick together - they move as
one in the direction of the object with a larger momentumWhen
objects bounce off each other - momentum is transferred from one
object to anotherNewtons 3rd Law explains momentumSwinging a bat
has a lot of momentum, once it hits the baseball the momentum is
transferred to the baseball sending it away with an equal
momentumSwinging bat is the action force, the ball hitting the bat
is the reaction force
Calculating Momentum
Calculating Momentum p = m v m = mass v = velocity
What is the momentum of a 50 kg boulder rolling 10 m/s south toward you? p = 50 kg 10 m/s p = 500 kg m/s south
You TRY: What is the momentum of an ostrich with a mass of 120
kg running with a velocity of 16 m/s north?
Momentum PracticeShow your work, answer in complete
sentences
A 100 Kg tiger is running with a velocity of 30 m/s east. What is
its momentum?A 200 kg wildebeest is running with a velocity of 20
m/s east. What is its momentum?What do you predict will happen when
the two animals collide?A car and a train are traveling the same
velocity, do they have the same momentum? Explain.Which of the
following has the smallest amount of momentum?A loaded 18-wheeler
driving 50 m/sAn car driving 50 m/sAn empty 18-wheeler driving 50
m/sA loaded car driving 50 m/sWhen a car is hit from behind, it
sometimes will also hit the car in front of it. Why does this
happen?
Tuesday December 13, 2011
Warm Up
Classwork
#57 Conservation of Momentum picture analysis#58 Conservation of Momentum paragraph
HomeworkComplete # 58
Conservation of Momentum Paragraph
http://www.flickr.com/photos/physicsclassroom/galleries/72157625280491634/#photo_5168222102Look
at the 15 pictures on the webpage, and read the descriptions
associated with each pictureAnswer the questions for each
pictureWhy do the boys in picture 1 represent momentum?What is the
force that causes a momentum change?If a train gets off-track, why
would its momentum be difficult to stop?Why is it correct to say
that boxing is all about momentum?Why does the velocity of a
martial arts experts hand play an important role in breaking the
stone?Why would it be better to have several small collisions
rather than one large one?How do seat belts and safety features
help in a crash in terms of momentum?In football the how does the
collision of 2 players conserve momentum?If you lift 3 spheres in a
Newtons Cradle, how many would you expect to come out on the other
side and why?In bowling, which object has the most momentum (pins
or bowling ball) and why?Why does the 4 ball loose momentum in the
billiards scenario?Air Hockey: Why would it be beneficial to study
conservation of momentum in an environment with zero
friction?Baseball: where does the momentum from the baseball
players swing go?Water Balloon: Where does the momentum to break
the balloon come from?
Choose one picture to write a 5 sentence paragraph about. You will discuss: Where does the momentum begin in the picture what are the factors that affect momentumWhat does the Law of Conservation of Momentum state How is momentum transferred and conserved in the picture. (do they objects stick together or bounce off?)
Wednesday December 14, 2011
Warm Up
Classwork
#58 Ne#59
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