User:Caroline Norman24/enes-100/project 2

My instructors page

Project
Escher

Problem Statement
''In one or two sentences, describe the project that your group will be working on. Identify what CDIO phase (Conceive, Design, Implement, or Operate) your group will complete in this project cycle.''

Project Plan
Briefly describe your group's plan for the next 4 weeks, including major tasks that will be completed each week.

Week 5 Narrative
Rolling friction was calculated with the formula for Friction is F= I×α÷R The I= 2÷5 MR² and stands for rotational inertia.

The α= 5×g×sin θ ÷ 7R and stands for angular acceleration.

The final formula for F= 2×g×sin θ ÷ 7

The mass of the big marble is 8.368g and the small marble is 1.044g

θ= 3

g= 9.8

Big marble friction = 2×8.368 ×sin 3 ÷ 7 = 1.262 gsec²

Small marble friction = 2×1.044 ×sin 3 ÷ 7 = 0.1530 gsec²

The next step is to find a formula that can be used to calculate the friction on different surfaces and not just the friction in general.

Week 6 Narrative










The first picture is of using books and magazines to find the angle that will allow objects to slide down it. The second picture is measuring to find out what the degree of the angle is. The third picture is the board with painter's tape on it and the fourth and fifth both have sandpaper.

The 5 objects were run down the track and timed in seconds. There was an average taken over 3 trails. The 5 objects were a domino, Jenga block, playing cards still in the plastic wrapper, Uno cards, and a DVD. They were run down the track at a 20 degree angle with painters tape over the track, 100 grit sand paper over the track and 220 grit sand paper. They were timed in seconds and an average was taken over 3 trails. The times were all compared to the track with nothing on it. The100, and 220 grit sandpaper stopped all the objects from moving down the track. The sandpaper had a lot of friction so all 5 objects could not over come it. The plain track and the painter’s tape had some friction but not a lot. This meant that the objects could over come it and were able to start moving down the track.

Domino on the plain track

Jenga on the plain track

Playing Cards on the plain track

Uno Cards on the plain track

DVD on the plain track

Domino on taped track

Jenga Block on a taped track

Playing Cards on the taped track

Uno Cards on taped track

Week 7 Narrative












The 4 objects were run down the track and timed in seconds. There was an average taken over 3 trails. The 4 objects were a domino, Jenga block, piece of wood and a piece of Styrofoam. They were run down the track at a 30 degree angle with painters tape over the track, 100 grit sand paper over the track, 220 grit sand paper and aluminum foil. They were timed in seconds and an average was taken over 3 trails. The times were all compared to the track with nothing on it. The 100, and 220 grit sandpaper stopped all the objects from moving down the track. The sandpaper had a lot of friction so all 4 objects could not over come it. The plain track, the painter’s tape and the aluminum foil had some friction but not a lot. This resulted in all the objects except the piece of Styrofoam being able to over come it and start to start moving down the track.

[https://www.youtube.com/watch?v=DbvRXpi5xU0&feature=youtu.be A Piece of Wood on Taped Track at 20 Degrees. ]

A Domino on Plain Track at a 30 Degree Angle

A Jenga Block on Plain Track at a 30 Degree Angle

A Piece of Wood on Plain Track at a 30 Degree Angle

A Domino on a Taped Track at a 30 Degree Angle

A Jenga Block on a Taped Track at a 30 Degree Angle

A Piece of Wood on a Taped Track at a 30 Degree Angle

A Piece Styrofoam on a Taped Track at a 30 Degree Angle

A Domino on an Aluminum Foill Track at a 30 Degree Angle

A Jenga Block on an Aluminum Foil Track at a 30 Degree Angle

A Piece of Wood on an Aluminum Foil Track at a 30 Degree Angle

Sliding Friction Formula

Ff = (μ)(N)

N= (g)(m)(cos ϴ)

Ff = (μ)( g)(m)(cos ϴ)

where

Ff = frictional force

μ = static (μs) or kinetic (μk) frictional coefficient

N = normal force

Ff - Frictional Force

μ - coefficient of friction on different surfaces

g - acceleration due to gravity which is constant at 9.8

m - mass of the object

cos ϴ - angle of the board or whatever surface the object is sliding down

Week 8 Narrative






There was a big marble, a small marble and a glass marble tested on a track of aluminum foil, 100 and 220 grit sandpaper at a 5 and 10 degree angle and then compared to a track at 5 and 10 degrees with nothing on it. The goal was to see which angle and which surface made the marble go down the fastest and with the least amount of friction.









The next step was to use a big marble, a small marble and a glass marble to test on a track with bumpers where the bottom was coated in aluminum foil, 100 and 220 grit sandpaper and then compare it to the bumper track with nothing on it. The goal was to see which surface on the bottom of the bumpers would make the marble go down the fastest and with the least amount of friction.

Aluminum Foil At A 5 Degree Angle

The Big Marble

The Small Marble

The Glass Marble

Aluminum Foil At A 10 Degree Angle

The Big Marble

The Small Marble

The Glass Marble

100 Grit Sandpaper At A 5 Degree Angle

The Big Marble

The Small Marble

The Glass Marble

100 Grit Sandpaper At A 10 Degree Angle

The Big Marble

The Small Marble

The Glass Marble

220 Grit Sandpaper At A 5 Degree Angle

The Big Marble

The Small Marble

The Glass Marble

220 Grit Sandpaper At A 10 Degree Angle

The Big Marble

The Small Marble

The Glass Marble

Bumper Track Plain

The Big Marble

The Small Marble

The Glass Marble

Bumper Track Aluminum Foil

The Big Marble

The Small Marble

The Glass Marble

Bumper Track 100 Grit Sandpaper 

The Big Marble

The Small Marble

The Glass Marble

Bumper Track 220 Grit Sandpaper 

The Big Marble

The Small Marble

The Glass Marble