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Lab 02: Acceleration vs. Angle (Physics Honors D)
CQ Physics Honors D
Purpose: To determine if a relationship exists between the angle of the motion track and acceleration of the motion car, and if so, to investigate that relationship.
Procedure: Using the lab station as is, record the angle of the track, and push the car up the ramp so its displacement is zero.
Use the GLX motion sensor (at sampling rate at 50/sec) and graph to interpret the car’s motion.
Find the car’s acceleration after each trial using the analysis tools.
Repeat 19 times.
position the motion sensor in line with the track.
check data sampling rate.
move & scale to view.
use linear fit tool / swap cursors.
What is the best way to determine if a relationship exists between two variables?
The best way to see a relationship between two variables is through a graph. The x-axis represents the independent variable, and the y-axis represents the dependent variable. The graph’s positive trend shows evidence of an existing relationship, which shows that as the angle (independent variable) increases, the acceleration (dependent variable) increases too.
How do you know what data should be examined and what data should be ignored?
While recording the motion of the cart, the most accurate way to measure its position is to press record, push the cart, catch it, stop recording, and then scale out the unhelpful data on the GLX. The “noise” is relatively easy to spot, easiest to see on the position graph because it is very different looking than the smooth, symmetrical parabola curve.
What is the best way to record the information during the lab?
A neat data table with the columns labeled “trial number” or a specific unit proved to be the most efficient way to record information during the lab. See my replicated one below.
What is the best way to report the lab results?
I think the most effective way to report lab results is using a graph (visual) and writing with data (argument with evidence).
The relationship between angle of the track and the acceleration of the car is easily represented on a graph, with the angle on the x-axis, and the acceleration on the y-axis. As the angle of the track increased, so did the cart’s acceleration.
For 19 out of our 20 trials, this remained true. One varied-this does not automatically mean our data is wrong, just that, in actuality, there are more uncontrolled variables than just the acceleration of the cart. Our 13th trial had an angle of 21 and an acceleration of 3.49, but this is an increased angle and decreased acceleration to our 12th trial (19 and 3.74, respectively).
Overall, I think this lab went really well. I definitely got better at using the GLX and now I understand the applied concepts that have been covered in class and in KhanAcademy much better. I think this lab was also probably good practice for not always perfect data.
See graph and data table posted above.
PUMA Lab II - Fall 2011PUMA Lab II - Fall 2011
words // Brandon Richard
PUMA has reached in their vault of classic footwear to ready the Lab II for a 2011 reintroduction. Originally released as a racing flat in 1984, the Lab II is a lightweight trainer with an innovative heel design initially utilized for a more comfortable running feel. Additionally, there’s a pyramid profile on the outsole that was specifically designed for traction.
However, today’s version of the Lab II isn’t particularly intended for the track, as its sleek, low-profile look is geared toward adding a twist to your everyday footwear lineup. Stashed in the PUMA vault for several seasons, the Lab II will be re-released in limited quantities this month at retailers like Shoebiz in San Francisco, New York’s David Z, and Net Philadelphia. Available in four colorways (the two pictured here + Navy and Steel Grey pairs), the Lab II will retail for $65.
#3 ELAEAGNACEAE Shepherdia argentea
Common name: Buffaloberry
Growth: Erect shrub 2-4m tall
Stems: thorn-tipped side shoots, twigs white-mealy becoming gray
Leaves: Oblanceolate, 2-4cm, white-mealy on both sides
Flowers: hypanthium mealy and 1-3mm long; sepals golden on the inside; male sepals 0.5mm long, female sepals 1mm long
Fruit: Red and juicy. Ovoid, 5-7mm, edible. Mix with bison and you got pemmican.
Habitat: Cool slopes in grasslands, riparian thickets, forests, plains
Distinctive characteristics: Bright red berries and the stems have sharp thorns.
#4 Elaeagnaceae Shepherdia canadensis
Common name: Soapberry or Canada Buffaloberry
Growth: Shrub 1-2m tall
Stems: Unarmed. Twigs brown-mealy becoming gray
Leaves: Narrowly ovate, 2-10cm long, green above, white and brown mealy beneath
Flowers: hypanthium brown-mealy, 2-4mm long; sepals yellow-green on the inside; male ca. 1mm long, female 1-2mm long, stellate-pubescent (star-like with short, soft hairs) at the base
Fruit: Red, ovoid, 5-7mm long, insipid
Habitat: Forests, woodlands, plains, valleys, montane areas. Increases with fire.
Matt Lavin Photos: Rust-colored scale-like hairs on underside of leaf, Upper side of leaf, Entire shrub, Underside of leaf, Leaves, stems, Flower, Closeup of underside of leaf, Matt has a few more pictures of similar things…
Distinctive characteristics: Canadensis looks similar to argentea. Differentiate by observing the rust-colored scale-like hairs on the underside of canadensis’ leaves. Also, canadensis has greener leaves and does not have thorns, while argentea is well armed.