# Pulley Lab Report - DOC

Document Sample

Pulley Lab Report

Data
*to get resistance force: multiply mass kg x 9.8m/s2
*effort force is the reading on your scale in N
*resistance distance is how much the weight moves
*effort distance is how much the scale moves

Table 1-fixed pulley
Mass kg resistance force effort force resistance distance effort distance
.5
1

Table 2-block and tackle
Mass kg resistance force effort force resistance distance effort distance
.5
1

*work input = effort force x effort distance
*work output = resistance force x resistance distance
Table 3
Fixed Pulley                      Block and Tackle
Mass( Work Input(J) Work Outpu(J)t Work Input(J) Work Output(J)
.5
1

Efficiency = work output/work input x 100
Table 4
efficiency
Mass fixed pulley        block and tackle
.5
1

Analysis
1.The effort distance is very much greater than the resistance distance in
which machine?

2.The effort force is very much less than the resistance force in which
machine?
3.In which machine is the work output greater than the work input?

4.Explain how using a single fixed pulley to raise a flag makes the task
easier:

5.Explain how using a single fixed pulley to raise a flag makes the task
easier:

6.Compre the efficiencies of the single fixed pulley and the block and tackel.
Why would you expect the block and tackle to be less efficient than the
single fixed pulley?

DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
 views: 75 posted: 11/17/2012 language: English pages: 2
How are you planning on using Docstoc?