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course Phy 201
Nov 21, 201110:20
I hope this was the kind of report you were looking for. If there's anything that I can change/improve just let me know!
Thanks" "Domino Dimensions ~ Aug 22
This data was taken for the accuracy in measuring for future experiments because not all dominoes are of the same width, length and height.
This particular domino had the dimensions:
1cm x 2.5cm x 5.2cm
Rubber Band Forces ~ Aug 22
The System: a three rubberband system connected by a paper clip in the center.
The Purpose: to get the idea that rubberbands exert greater tension forces when stretched to greater lengths.
This experiment was based on concept, not data.
Rubberband and Cart ~ Aug 22
The System: pulling a cart with rubberbands.
The Purpose: to provide students with the concept of net force.
Strap Coasting to Rest ~ Sept 7
The System: a metal strap balanced and rotating on a domino
The Purpose: to find the rate of change of the angle of rotation with respect to clock time.
The Data:
trial 1 - 720 deg in 6 sec
trial 2 - 1200 deg in 12 sec
trial 3 - 600 deg in 3 sec
With this data I was able to find the angular velocity of the strap by using the formula d'deg/d's (change in degree with respect to clock time). From this experimpent, I could also find the average angular velocity and the change in angular velocity between trials.
Ball Drop ~ Sept 12
The System: a ball is dropped and freely falls to the floor
The Purpose: to find the velocity and acceleration of the system
The Data:
Dropped from rest (V_o = 0ft/s)
Dropped from 5ft (displacement - d's = 5ft)
Takes 0.5 seconds to hit the floor (change in clock time - d't = 0.5sec)
With this data I was able to find the average velocity (d's / d't), the final velocity ((V_o + V_f) / 2 = V_ave), the change in velocity, the acceleration (change of velocity with respect to clock time d'v / d't)
Ramp & Ball ~ Sept 12
The System: a 60cm ramp leans on a stack of __ dominos; a ball rolls from the top, starting at rest, and rolls to the bottom of the ramp and off the edge all the way to the floor (90cm)
The Purpose: application of finding velocities, with these velocities one can find accelerations; this also helps with the projectile concept and the implication of gravitational forces.
The Data:
2 Dominos (in class)
V_o = 0cm/s
V_ave = 15 cm/s
V_f = 30 cm/s
d'V = 30 cm/s
3.4 sec to end of ramp
horizontal displacement: 12cm
3 Dominos
V_o = 0cm/s
V_ave = 25.53 cm/s
V_f = 51.06 cm/s
d'V = 51.06 cm/s
0.35 sec to fall
horizontal displacement: 17cm
4 Dominos
V_o = 0cm/s
V_ave = 31.58 cm/s
V_f = 63.16 cm/s
d'V = 63.16 cm/s
1.9 sec to fall
horizontal displacement: 22cm
Car Acceleration ~ Sept 14
The System: a strap has a rod running through the middle with two rubberband systems set up on each end; the rubberband system include two sets of two strands of rubberbands with a car in between the two chains; one set is shorter than the other
The Purpose: showing tension forces and the way they react, the heavier mass produces a greater force
The Data:
Pulled Back: Length: Time:
1cm 44cm 1.9s
2cm 16cm 1.25s
3cm 7.5cm 1.1s
Car 1 (on the left) has the greater mass and is exerting more force; therefore, the system rotates counter-clockwise
One Ball and Two Ramps ~ Sept 19
The System: two ramps (30cm and 60cm) both on an incline beside/alined with one another to the edge of the table; the ball, from rest, rolls from the top and off the edge to the floor with a horizontal displacement of 12cm from the edge of the table
The Purpose: learning to solve sytems that have changing velocities and accelerations instead it being uniform
The Data:
30 cm (1st ramp) in 2.5s
60 cm (2nd ramp) in 3.5s
0.4s to fall to the floor
(1st) (2nd)
V_o = 0cm/s (1st) = 24cm/s (2nd)
V_ave = 12cm/s = 17.14cm/s
V_f = 24cm/s = 10.28cm/s
Rolling Ball ~ Sept 28
The System: dominos prop up a ramp and a ball rolls down it
The Purpose: to compare the velocities and accelerations of the ball on different slopes
The Data:
Ramp Length - 61cm
1 Domino: 0.9cm width with a roll time of 2.8s
2 Dominos: 2.5cm width with a roll time of 1.9s
3 Dominos: 5.1cm width with a roll time of 1.62s
Rubberband Stretch ~ Oct
The System: a rubberband chain made of 2 skinny rubberbands and 10 wide rubberbands are stretched to certain distance and the two sections are measured
The Purpose: to compare forces and show that one corresponds with the other
The Data:
Stretched Skinny Wide
90cm 14.5cm 75.5cm
100cm 19cm 81cm
110cm 25cm 85cm
120cm 29.5cm 90.5cm
130cm 33.5cm 96.5cm
When graphed, the trend is linear with a fairily constant slope
Dominos Dangle ~ Oct
The System: hanging dominos from a rubberband chain made of 9 thick rubberbands
The Purpose:to show that the more massive the mass the more tension force there is in the rubberband chain
The Data:
Mass Width Stretch
2 Dominos 30g 1.9cm 65.5cm
4 Dominos 60g 3.8cm 68.5cm
6 Dominos 90g 5.8cm 72.4cm
8 Dominos 120g 7.7cm 77.8cm
10 Dominos 150g 9.5cm 84.5cm
Car, Dominos, Incline ~ Oct
The System: car on the end of a rubberband chain with dominos strapped to it; on a movable incline; mark where gravity takes over frictional and normal force (when it first moves)
The Purpose: to show that the more massive mass creates the most force on the rubberband, therefore pulling more noticably than the lighter masses
The Data:
The Angle # of Dominos Distance
5 deg 6 12.8cm
10 deg 5 13cm
15 deg 4 13.1cm
20 deg 3 13.3cm
30 deg 1 13.5cm
35 deg 2 14cm
Three Rubberband System ~ Oct
The System: three rubberbands (labeled A,B and C) are connected by a paperclip and are pinned onto a board so that the rubberbands are pulling against each other
The Purpose: mainly focusing on tension forces and how to calculate those forces with the data that one can collect from the system
The Data:
End Point Coordinates (cm)
(1.5 , 19)
(12.5 , 51)
(22.5 , 33.5)
(12.5 , 51)
(12.5 , 55)
(13 , 107)
With just this info I could find the lengths of each rubberband and the x and y components of each
Yellow Chain Lengths (when pulled out from the original system on each branch)
A. 26 cm
B. 25 cm
C. 24 cm
Yellow Chain Calibration (using Dominos as a unit of force)
1 Domino Stretched: 23cm
2 Dominos 24cm
3 Dominos 25cm
4 Dominos 26cm
5 Dominos 27cm
6 Dominos 29cm
7 Dominos 30cm
8 Dominos 32cm
With this info I could find force of the yellow chain of the original system by graphing force vs. length; once I found the angle and force, I could find the manitude and direction of the force
Balancing Dominos ~ Oct
The System: a styrofoam strap is balanced on a domino with one domino (A) sitting on one side and two (B & C) sitting on the other
The Purpose: using a rotating system to calculate the torque, angular velocity, angular acceleration, and inertia; making the transition from linear to angular/circular systems, application of Newtons second law (this is all applicable to an irregular system as well)
The Data:
Domino A is -21.5cm from the dice (balancing point) <---
Domino B is 8.5cm from the dice <--- Refered to as moment arms
Domino C is 14.5cm from the dice <---
Rotates 90 deg in 2s
Each Domino is about 15g
Force of -15000 dynes acting on each domino
Candy Bar Oscilation ~ Nov 2
The System: Dangling a candy bar or dominos from a rubberband and counting the oscilations per min
The Purpose: applies to the unit circle, allows us to find the angular velocity and acceleration
The Data:
Candy Bar - 162 ocilations in 1 min
4 Dominos - 126 oscilations in 1 min
8 Dominos - 98 oscilations
Gold Ball ~ Nov
The System: dropping a gold ball
The Purpose: mastering the application of calculating gravitation force and other forces
The Data:
1 cm diameter
13 g per cm^3
G = 6.67 * 10^-11 N m^2/s^2
F = 6.67 * 10^-11
= ...
= 0.0018 N
Truck ~ Nov
The System: a truck pulls out at 10cm/s and passes a car
The Purpose: real life application of V and a
The Data:
10cm ahead a = 20cm/s^2
10cm/s matching speeds
V_o = 10cm/s 0cm/s
V_f = 10cm/s 10cm/s
d'V = 0 cm/s 10cm/s
V_ave = 10cm/s 5cm/s
d's = 15cm 2.5cm
d't = 0.5s 0.5s
a = 0 20cm/s^2
V_o = 10cm/s 0cm/s overtaking the car
V_f = 10cm/s 34cm/s
d'V = 0 cm/s 34cm/s
V_ave = 10cm/s 17cm/s
d's = 27cm 28.9cm
d't = 1.7s 1.7s
a = 0 20cm/s^2
The resulting graphs from the info show 1. the car staying the same speed and the truck accelerating at a constant rate and 2. the car uniformly accelerating and the truck foring half of a parabola.
Collison ~ Nov
The System: a marble hits a steel ball
The Purpose: application if Newton's third law, finding relative velocities, momentums, understanding collisions
The Data:
15g marble rolls at 20cm/s
momentum = -300g*cm/s
60g steel ball rolls at 12cm/s
momentum = -600
total momentum = -900g*cm/s
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