Archive of ‘Science 10’ category

Rube Goldberg Project 2018

For this project I worked with Kennedy and Odett to build a machine with a task of pouring cereal into a bowl. Our thought process was that when we fill up one of the cups the mass will outweigh the second cup which will then lift up the lever pouring cereal into the bowl.

Our machine used many different types of energy including gravitational, mechanical, potential, kinetic and sound.

The systems we used are ramps (C, E, F, H), wheel and axel (G), a pulley (K) and a lever (L).

The first step on the right side starts at point (A) with the marble going through the toilet paper roll which goes from potential energy to kinetic. The marble goes through a hole in the bridge (C) into the cart (D) and onto the decline ramp (F) into the 1st cup (I) on the pulley system (K). On the left side the marble goes along the straw slide (B) through the bridge (C) onto the ramp (E) along the spinner (G) down the curvy path (H) and into the same cup (I). For energy, gravitational is used at all the points. Mechanical is used at points K and L. Potential is at points A and B but the energy changes to kinetic once it goes through point C. The sound energy is coming from the sound of the marbles as it goes through the course.

DNA Model

Deoxyribonucleic or DNA carries nucleotides or chemical bases that makes up each individuals genetics. DNA is carried by chromosomes. Humans inherit one set of 23 chromosomes from their mother and another set from their father. 22 of the sets are very similar but with a slightly different version of each gene on the chromosome. The pairing determines our sex. Females have two X chromosomes but males have one X chromosome and one Y chromosome. The Y chromosome carries the genes that create masculine features. DNA provides all the information needed for an organism to develop, survive and reproduce. There are pairs of chemical bases which form long sequences called genes. Genes are coded instructions for building proteins. Each gene produces one protein. These proteins are building blocks of the body. When isolated from the cell and stretched out the DNA looks like a twisted ladder which is called a double helix. The sides of the DNA are called the backbone and the steps are pairs of chemical bases that are arranged in a particular order. The four types of chemical bases are adenine, thymine, cytosine and guanine. In my model the backbone is made up of licorice and the chemical bases are made of marshmallows held by toothpicks. My marshmallows are arranged in a specific order to show how adenine (green) always pairs with thymine (pink) and cytosine (yellow) goes with guanine (orange).