1. Block and Tackle HO Debrief Tahoma Jr. High 8 th Grade Science Maple Valley, WA

2. # of pulleys = Mechanical Advantage Resistance distance (cm) how far object moves Effort distance (cm) how much rope is pulled Resistance force (Newtons) how much weight is lifted Effort force (Newtons) how much effort required to lift it 11203,000 21203,000 31203,000 41203,000 51203,000 61203,000 360 120 240 480 600 720 3,000 1,500 750 1,000 600 500

3. EXTENSION QUESTION: So, why does it seem easier when using only 1 pulley when there’s no change in effort or amount of rope pulled? Because by changing the direction to pull down you are allowing gravity to work with you instead of against you if you tried pulling it straight up without a pulley. INVERSE end show