Today, our class received an assignment on cannons. Basically we need to build a cannon from a maximum of 5 pop cans and try to see which one will go the furthest. I do not know how we are supposed to make a base for the cannon if the tube thing is going to use 3 cans and only 2 left for the base. The cannon will be fueled with ethanol and the ball will be two Styrofoam cups taped together. Hopefully the cannon that we build will work.
Here's a HANDDRAWN picture of what the cannon will look like, (copied from the sheet).
Tuesday, November 30, 2010
Saturday, November 27, 2010
Newton
We began learning about Newton's laws and 4 different types of problems.
Equilibrium problems is when the object is not moving and the forces are equaled out.
Angles are included. Usually it's an object in the air that's connected to beams or strings. This needs to counter gravity to make the net force 0.
Incline is when there is a slanted surface. Usually to calculate how fast the object is going and how much force is in the x direction. The fbd needs to be shifted and gravity needs to be changed into x and y. There is usually friction force which is part of fx.
Pulleys, there are usually no friction. Tension is the same. It usually calculates how fast the object is accelerating and the force on the string that is connected to the two objects.
Finally, for trains, it is similar to just making the pulleys into a straight line. There is a force applied and then the person needs to find out the tension between the cars. The force applied is the most then decreases after each tension along the train. There is usually friction. There is no Fy.
Equilibrium problems is when the object is not moving and the forces are equaled out.
Angles are included. Usually it's an object in the air that's connected to beams or strings. This needs to counter gravity to make the net force 0.
Incline is when there is a slanted surface. Usually to calculate how fast the object is going and how much force is in the x direction. The fbd needs to be shifted and gravity needs to be changed into x and y. There is usually friction force which is part of fx.
Pulleys, there are usually no friction. Tension is the same. It usually calculates how fast the object is accelerating and the force on the string that is connected to the two objects.
Finally, for trains, it is similar to just making the pulleys into a straight line. There is a force applied and then the person needs to find out the tension between the cars. The force applied is the most then decreases after each tension along the train. There is usually friction. There is no Fy.
Monday, November 8, 2010
I BALANCED AN EGG
Woo, it's Monday Nov, 8 today. I was bored, so I went to try balancing eggs to get ready for tomorrow challenge. And..I actually did it. Took around 10 minutes for the first one. Pictures below.
After two I just gave up and went to do my homework.
Then I was able to balance two.
Friday, November 5, 2010
Projectile Motion
To calculate projectile motion, we need to use sin, cos, and tan. Usually there is an angle. The question usually asks about the time of flight and the horizontal distance from the start.
The big five equations are used to solve these.
Here is an image showing what each part is equal to. Theta is the angle of the path to the horizontal. horizontal distance is range in x and the height is in y.
The big five equations are used to solve these.
Here is an image showing what each part is equal to. Theta is the angle of the path to the horizontal. horizontal distance is range in x and the height is in y.
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