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
Mass kg
Resistance
force
Effort force
Build Figure A-fixed pulley
Resistance
Effort
distance
distance
0.5 kg
1.0 kq
Mass kg
0.5 kg
1.0 kq
Resistance
force
Build FIGURE E -block and tackle
Effort force
Resistance
Effort
distance
distance
Mass
0.5 kg
1.0 kg
Mass
0.5 kg
1.0 kg
Table 3
*work input = effort force x effort distance
*work output = resistance force x resistance distance
FIXED PULLEY
BLOCK & TACKLE
Work Input (J) Work Output (J) Mass
Work Input (J) Work Output (J)
0.5 kg
1.0 kg
Table 4
Efficiency = work output/work input x 100
FIXED PULLEY
Efficiency
Efficiency
Mass
0.5 kg
BLOCK & TACKLE
Efficiency
Efficiecny
1.0 kg
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 tackle. Why
would you expect the block and tackle to be less efficient than the single fixed
pulley?