- #1

fisselt

- 38

- 0

## Homework Statement

I have 2 blocks. M1 is resting on a horizontal plane and attached to a string that goes over a pulley to M2. The plane is like an air hockey table to simulate very little friction. I attached spark tape to M1 so I could measure the time it took and distance traveled. Now, reality and the numbers I got from my equations do not jive:

Test1

m1=.1897kg

m2=.02kg

Distance traveled on plane(X1)=.8462m

Time to travel(X1)=1.5s

actual acceleration =.38m/s^2

predicted acceleration=.9347m/s^2

Test2

m1=.1897kg

m2=.04965kg

Distance traveled on plane(X1)=.7018m

Time to travel(X1)=0.9s

actual acceleration =.87m/s^2

predicted acceleration=2.0329m/s^2

Test3

m1=.2897kg

m2=.04965kg

Distance traveled on plane(X1)=.6797m

Time to travel(X1)=1.2s

actual acceleration =.47m/s^2

predicted acceleration=1.4338m/s^2

## Homework Equations

I used a = m2g/(m1+m2) to predict acceleration

## The Attempt at a Solution

It must be that friction is a factor in this but I do not know how to calculate friction yet. I think it is the normal force of M1 times some constant but I'm not sure how to get it from there. It should be simple but the method escapes me. For instance in test 2 and 3 the set up is identical except I added .1kg to M1 so that I could find some friction value.

thanks for the help