Forces in 2D motion???

A force that is analyzed in a 2D motion is vector with 2 components. Since they're 2D, they're looked at on the X and Y axis.

In Uniform Circular Motion, a NET FORCE drawing towards the inside of the circle causes objects to move in circles because it's at a constant speed. But it's constantly accelerating because the object is constantly changing direction 
 -the direction of an object in circular motion's acceleration is inwards. 
-objects in orbit move in uniform circular motion around another object. 
-Planets and satellites are able to orbit because they have net force acting upon them and it keeps them moving in circles at a constant speed=gravity=keeps earth orbiting the sun; pulling us towards it

Inside the iPad

My iPad is a commonly used source of technology in my life. It's very complex and can do a thousand things, but only for a certain amount of time until the battery runs out. It contains a lithium-polymer battery includes lithium ion that grows bigger so that it can store a greater charge.  It allows lithium ions to move from the negative conductor of which the electricity is leaving UPHILL, exemplified in the following image:

The Class Connection

In class, we used lemons as a battery!!!
We used a penny for negative charge and a nail for positive charge stuck them into the lemon on both sides.  The lemon contains a lot of electrons so when we connected the penny and the nail with a cord, electrons could flow! Amazing!!!

What is Projectile Motion?

To find out what projectile is, Gabi and I shot some hoops! I shot a freethrow and she recorded me using the Video Physics app. She tracked the basketball's arc using blue dots from when I shot(released) it, to when it went through the hoop.. Nothing but net. Not only did we play basketball, we learned how to use the Video Physics app and analyze aspects of an object that has been projected or thrown. (and its speed and acceleration)

Check it out..

these are our data graphs:

Defined Projectile motion and compared the X and Y components.

X velocity

Y velocity

Real Life Connection: Rainbows are parabolas!!!

Hover Disc and Fan Cart Lab

Purpose: To understand Newtons 3 laws of motion. 

To Find the 3 laws of motion, we conducted an experiment using a hover disc that looked like  soccer balls. They moved really smoothly and it was a lot of fun! We also use carts powered by fans. We found out more about force, mass and acceleration. 

Hover Disk Lab

Big Question: What gives rise to a change in motion and?

Key DATA:

We discovered forces between objects.

-Normal Force, Fn: acts Upward on an object (opposite direction of gravitational)

-Friction Force, Ff: the friction between to objects on contact

-Gravitational Force, Fg: Earth is pulling down on an object (gravity)

-For every action, theres an equal and opposite reaction meaning if two objects make contact, they will both exert an equal amount of force onto each other except they will be in opposite directions.

Real World Connection:

When 2 pool table balls collide they will exert the same amount of force on each other but they they will be in opposite directions..

Fan Cart Lab

Big Q: what's the relationship between mass, acceleration and force.

Lab Summary:

We used a fan cart with a constant force (No Net force) and put it on a track with the force probe. We would add different weight to the cart to find the relationship between the mass of the cart and the force and the acceleration that was measured as well using a logger pro.

We CONCLUDED that the relationship between mass and acceleration is indirect.

We derived the equation, f=ma: Force equals mass times acceleration.

Acceleration is depended on by the mass. 

Also, an object moving at constant speed will stay at that constant speed. An object with no motion, will remain motionless until force changes it.

So much knowledge!!!!!

Impulse Lab

Big Question: What is the relationship between impulse, force and time in a collision?

To answer the big question, we crashed the car into a force-probe attatched to the ring stand. We measured  car's velocity and all of it movement before the collision and then after the collision. We used metal bands to slow the collision down(slowed time down). This made it an elastic collision. 

  
Key Information:
-Impulse also equals the change in momentum; Momentum final minus momentum initial. J=Pf-Pi
-Impulse is constant when objects collide
-J=FT

Lab Conclusion: 
The Big answer is that force and time are inversely proportional. Force and time: Impulse equals force multiplied by time (J=FxT)

Real World Connection:
 When two players are running and collide, they're pads act as the metal rings to slow down time, the times it takes for the them to actually collide. It also reduces the impact of the collision. 

Collisions Lab

Big Question: Is energy or momentum better conserved in a collision?

Lab Summary: This week, we got to make cars collide! We collided a red car and a blue car. They were both 0.25kg. We did 2 different collisions. One was inelastic, where the 2 cars collided and the velcro strapped together, which then caused them to share the same energy and motion. Since they had the same mass, the car with less velocity before the collision, when collided/attached to the other car got taken with faster car then going the opposite direction. The elastic consisted of the 2 cars colliding then bouncing off one another and going opposite directions because of the spring. 

THE LAB: Photo taken by, Trevor Dunbar                                     :)

DATA: 

INELASTIC CALCULATIONS:

ELASTIC CALCULATIONS:

Our calculations show the "Big Answer"; Momentum is better conserved than energy in a collision

KEY INFO: -I learned that momentum is mass in motion. p=mv

                     -Momentum is conserved

                     

Real World Connection:

In the sport of basketball, when 2 players collide, it is not smooth. The player who weighs the most and is going the fastest will determine who will get the best of the collision and momentum will be transferred.

Rubber Band Cart Launcher Lab

Big Question:

How are energy and velocity related?

Lab Summary:

We put a cart on an air track and then pulled it back a certain distance/gave it a certain amount of energy to find the velocity the cart had. It was measured by the photogate sensor. We did this multiple times to get more accurate data.

What did you learn?

When the cart is released and the rubber band sends it flying down the air track, the elastic energy in the rubber band transferred to the pink cart; this is kinetic energy. 

"Big Answer"

The further back the cart pulls the rubber band back, the more energy is transferred to it when it's released which causes the velocity of the cart to increase. 



DATA:

Equation used:

Ug=mgh

K=1/2massXvelocity^2

Real World Connection

Once again, this is related to when Baby Cupid shoots his bow and arrow to make somebody fall in love. The further he pulls back his bow, when he releases it, the energy will transfer to the arrow, the more velocity it will have/faster it will go!