Mr. TurkettHonors physics

--------------------------------------------Semester 1

thanksgiving review----------------------------------------------

Due 11/30 – 12/1 (a/b day)Extension assignment

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Unit 1 – vectors, KINEMATICS, FREE FALL & PROJECTILE MOTION

v=dt

a=∆vt

=v f−v it

v f=v i+at

d=v i t+12a t 2

v f2=v i

2+2ad

PythagoreanTheorem :

a2+b2=c2

a=acceleration(ms2 )d=displacement (m )

t=time (s )

v=velocity (ms )

ProjectileMotion Equations :

d y=v iy t+12a t2

d x=v x t

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If you see constant speed or constant velocity in a problem you will be using the v = d/t equation.

If you have accelerated motion in your problem you must discover what variable you are missing and use the acceleration equation that is missing that variable (ie. d, t, vi, vf)

Scalars only have magnitude (amount) Vectors have magnitude and direction To find a resultant vector you will need to use Pythagorean

theorem HINT: Look at the units to help you discover what you are given

and need to find! Free fall motion uses a = g = -10 m/s2 and vi =0 (unless you

throw/shoot something upwards, the vi is present) Projectile motion follows free fall in the vertical motion and

constant speed in the horizontal motion

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Maggie Tude flys Cornucopia from Baltimore to Chicago and then from Chicago to Seattle. The distance from Baltimore to Chicago is 604 miles and the distance from Chicago to Seattle is 2064 miles.

a. What is the total distance Maggie travels?

b. What is her displacement?

Dy Rection flys Mayflower from London to Boston, a distance of 3,269 miles. He then takes a shuttle from Pilgrim Traveling Services from Boston to Plymouth Rock, a distance of 40 miles.

a. What is the total distance Dy travels?

b. What is his displacement?

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UNIT 1-1: FLIGHT OF THE TURKEYS

A lot of people travel home for the holiday season to spend way too much time around family. Maggie Tude and Dy Rection are setting off on their trips home. They both like different airlines and have selected different flights to get them home.

a. Assume one balloon can finish the parade in 1 hour (3600 seconds). What is the average speed of the balloon?

b. A mishap has happened and the balloon handlers have let go of Snoopy the Flying Ace! Snoopy begins to ascend to the skies. Say Snoopy began with an initial speed of 0 m/s and ends up traveling 100,000 meters to the edge of the atmosphere. At what speed would Snoopy be traveling when he reached the outer atmosphere?

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UNIT 1-2: FLYING ACE

Snoopy the Flying Ace balloon is a common Macy’s Day Parade attendee, appearing a total of six times. The parade travels a total distance of 9,700 meters. The entire parade takes, on average, three hours to complete.

Penny Pincher has been waiting at the front of the line at the local mall in order to grab the newest smartphone coming out this year. She has been drinking coffee for 5 hours straight now and is ready to burst down the aisles to get her present.

a. As the doors open Penny starts from rest and runs to her top speed of 3 meters per second in 4.5 seconds. What is her acceleration?

b. What distance does Penny run in that 4.5 seconds?

c. For the next 30 seconds Penny is running at her constant speed of 3 meters per second. What distance does she run in those 30 seconds?

d. Penny spots her smartphone a distance of 10 meters up ahead and begins to slow down. At what acceleration should she slow down to come to a complete stop in front of the product?

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UNIT 1-3: BLACK FRIDAY DASH

Consumers in America love Black Friday shopping. Some people have a tradition to get to the stores at 5 am to get all the great deals. Penny Pincher has been camping out since after 3 pm dinner ended for all the newest electronics and toys.

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Ditch aims his shot so that it will hit the turkey when it flies directly above him. The turkey is flying a height of 12 meters above the ground at a constant speed of 24 m/s horizontally. Assume the height of Ditch and his gun pointing up is 3 meters, so that the bullet starts 3 meters above the ground.

a. If the bullet has an initial velocity of 120 m/s out of the rifle, then what is the final speed of the bullet when it hits the turkey?

b. How much time was the bullet in the air?

c. Ditch hits the turkey! The turkey then falls in horizontal projectile motion from the height of 12 meters. How much time does it take the turkey to hit the ground?

d. What horizontal distance must Ditch Mullet walk to retrieve his turkey?

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UNIT 1-4: TURKEY SHOOT

Ditch Mullet is in the forest looking for turkeys to kill for his Thanksgiving meal. He spots a rafter of turkeys ahead of him and has the genius idea to scare them so that they fly into the air and he can shoot at them in flight.

UNIT 2 – FORCE & FRICTIONFnet=∑F=ma F f=μ FN Fg=mg

a=acceleration(ms2

)

∑ ¿∑ of (F1+F 2+…)

Fnet=net force (N )

F f=friction force (N )

Fg=weight (N )

FN=normal force (N )

g=accelerationdue¿ gravity=9.81 ms2

μ=coefficient of friction

m=mass ( kg )

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Net force is the sum of all the forces acting in one direction (ie. horizontal or vertical)

o Note: If you move in the opposite direction then you subtract instead of add

You can be moving and have net force of zero. You will have zero acceleration and be moving at constant velocity.

o constant velocity = no accelerationo changing velocity = acceleration

The normal force is a “surface” force and is perpendicular to the surface you are on

The coefficient of friction is unitless, and tells you how easily it is to move across the surface (should be # between 0 and 1, closer to 1 means a rougher surface, closer to 0 is a smoother surface)

You can round g to 10 m/s2

Weight is a force …mass is not a force

UNIT 2-1: WISHBONE FORCE

Roly Poly and Debbie Downer were given the turkey wishbone. Roly Poly was super excited and had the perfect plan to pull the wishbone with a lot of force. Debbie Downer was not as thrilled and was just going to let Roly Poly do all the work.

Roly Poly pulls with a force of 40 Newtons and an acceleration of his arm of 8 m/s2, while Debbie Downer holds the other end with a force of 5 Newtons.

a. Draw a free-body diagram to represent the forces.

b. Calculate the net force acting on the wishbone.

c. Calculate the mass of the wishbone that is accelerated with the pull from Roly Poly.

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UNIT 2-2: TREADMILL FRICTION

After consuming large portions of leftovers Bern Rubber decides that he will do some exercise on the treadmill. Bern has a brilliant idea to get rid of his pie gut by laying down on the treadmill and letting the fat just roll off his body due to the friction of the treadmill.

Let’s say that Bern sets the treadmill to run at a constant speed of 3 m/s. He then lays down on the treadmill and starts to “feel the burn”. Assume that the coefficient of kinetic friction on the treadmill is 0.25.

a. If Bern has a death grip on the handle bar, what is the net force on his body?

b. If Bern weighs 700 Newtons, then what would be the frictional force he experiences on the treadmill?

c. Knowing the net force and the frictional force, what force must Bern apply to the handle bars to not be flown back off the treadmill?

UNIT 3 - CIRCULAR MOTION AND GRAVITYv=ωr

ac=v2

rF c=m

v2

r

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Fg=Gm1m2r 2

g=Fg

m

ac=centripetal acceleration( ms2 )F c=centripetal force (N )

Fg=gravitational force (N )

g=acceleration due¿ gravity (ms2 )G=6.67 x 10−11 N m

2

kg2

m=mass(kg)

r=radius (m )

v=velocity (ms)

ω=angular velocity( rads

)

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Linear velocity is tangential to the circular motion at one specific point along the circle (this is the path of inertia)

o If you were spinning something with a string, and then cut the string the object would move in this linear line at the point of the cut

Linear velocity is constant in magnitude but changing in directiono KEY REVIEW : Vectors have magnitude and direction!

Since linear velocity is changing direction this produces an acceleration, and this acceleration always points to the center of the circle (centripetal = “center seeking”)

Since acceleration points towards the center your force is also directed towards the center

o Note : the Fc equation is derived from F = ma. 1 revolution is 2π radians or 360° Mass is directly proportional to force of gravity (as mass increases

force increases); distance between two bodies is inversely proportional to force of gravity (as distance increases the force decreases)

a. If Tommy kept a pace of 5 m/s and the radius of the pen was 10 meters then what is his angular speed?

b. What is his centripetal acceleration?

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UNIT 3-1: TURKEY CHASETommy Two-toes was sent out to fetch the turkey for Thanksgiving dinner. He proceded into the pen to chop off its head with his axe. Upon entering the turkey became enraged and started to chase Tommy around the pen in a circular motion.

c. Assume Tommy has a mass of 10 kg. What is his centripetal force around the pen?

Calculate the gravitational force between a football and the Earth. Assume you are on the surface of Earth, so the radius of the Earth is 6.371 x 106 meters. The mass of the Earth is 5.972 x 1024 kg and the mass of a football is 0.43 kg. (Don’t forget to use G = 6.67 x 10-11 Nm2/kg2)

Explain what you would tell Chip as to why the football doesn’t fly into space. (Use Newton’s Laws of Motion to help)

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UNIT 3-2: FOOTBALL GRAVITY

Football games are a great thing to fall asleep to after a long day of eating. Though the game would not be as fun without the presence of gravity on Earth. Chip Tofan wants to know why the football doesn’t just fly away from Earth when a kicker kicks the pigskin.

UNIT 3 – ELECTROSTATICS

Explain the process that allows the magic sorting hat to move when Carvey charges his wand and points it at the hat without touching the hat. Describe a possible scenario for the charge on both objects. (hint: magic is not the answer)

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There are three types of particles, the electron (negative charge), the proton (positive charge), and neutron (neutral charge)

Electrons are the particles that move Electrostatic forces can be attractive or repulsive

o Like charges repelo Opposite charges attract

In duction is the process of charging something by rearranging the particles inside

Con duction is the process of charging something by transferring particles by contact

UNIT 3-3: MAGIC SORTING HAT

Carvey Potter was playing with is wand one day and came across some spells that let him move objects around the room. One such spell required him to charge his wand with wool and then point it at the magic sorting hat.

Explain what would happen if Carvey touches the magic sorting hat with his wand and then holds the wand close to the hat. Describe a possible scenario for the charge on both objects. (hint: magic is not the answer)

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UNIT 4 – WORK, ENERGY, MOMENTUM & COLLISIONS

W = F*d E = W(Work-Energy

Theorem)

1 Calorie = 4190 J

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Unit 4 Introduction

We will discover that work and energy are related to each other. In fact, the work-energy theorem states that the net work done is equal to the change in energy of an object. Therefore, the units of measurement for both work and energy are the same, and scientifically described as joules “J”.

However, you are used to experiencing energy in other units. For instance, the food energy you gain from eating your Thanksgiving meal is measured in Calories. Often times during these holiday seasons we overconsume and then feel bad about our figures as we eye the “plumpkin” pie.

In this analogy, if energy is the food we eat then the work is the force we have to do over a distance to “work” off the “stuffing”. Whether it is pushups to move your weight up and down against Gravity, or the marathon distance running you do during Black Friday, when we exercise we are doing work that uses our food energy.

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