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Physics 105 Lab #2

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Xinyu Ma

on 29 January 2016

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Transcript of Physics 105 Lab #2

Physics 105 Lab #2
Introduction and Background
Physics Models
Experiment Setup
The raw data we collected plot time on the x-axis and push force on the y-axis. We take the mean value of the push force over time at each increment of weight. Since we did two experiments with a cart and with a sled, we have two sets of data on mass the push force.
In this experiment, we tested the physics model that mass is positively and linear related with push force. We also tested the theory that friction is positively and linear related with push force. We find quantitative agreements between the data and the theory.
Xinyu Ma, Marco Ortega, and Shamir Johnson
In this experiment, we are testing the relationship between mass and push force. In the meantime, we also test how friction affects the push force. These questions are fundamental in explaining athletic activities such as skating and skiing and transportation activities.

We did two groups of experiments. We used cart for the first experiment and sled for the second experiment. The mass of the cart is 9.79 kg and that of sled is 2.83 kg. In both experiments, we increased the weight of the mass from 25 lbs (11.34kg) to 125 (56.7kg) lbs, at an increment of 25 lbs (11.34) each time. We also compare the result from sled with that from cart.
In doing so, we see how mass and friction affect push force while holding other variables constant (direction, distance, etc.).

The physics model regarding this experiment states , "Push force equals the product of friction coefficient of the environment surface, the gravity, and the mass of the an object "

We hold friction coefficient and gravity constant in each experiment and test the relationship between the mass of an object and the push force.
We expect a positive and linear relationship between mass and force. We would also expect a bigger mu when increase the friction of the surface.
The graph on the left plots the relationship between mass and push force for the cart and that on the right plots that for the sled. The lines a linear fit. From both graphs, we can see a positive and linear relationship between mass and push force. Quantitatively, for the cart, a 1 kg increase in mass increases push force by
0.549 N
. For the sled, a 1 kg increase in mass increase push force by
4.04 N
. The friction coefficients for the cart is
and that for the sled is
. The R square indicates a very good fit. These results also mean that holding weight constant, friction is positively related with push force.
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