Potential Energy - Place any item at the top of something (example: a tape measure at the top of the stairs). Measure the height (in meters) from the ground to the item. Measure the mass of the tool (using the scale provided). What is the PE of the tool?Mass of piece of wood: 14.0g
Gravity: 10m/s Height: 1.285m PE=M*G*H PE=14*10*1.295 PE=140*1.295 PE=181.3J |
Kinetic Energy - Using the PE of the tool, measure the velocity of the tool as it is about to hit the ground in meters per second.Mass of piece of wood:14.0g
PE=181.3J KE=1/2*MV^2 181.3=1/2*14v^2 181.3/7=7/7v^2 √25.9=√v^2 5.089=v |
Calculate how much work you do when you carry something from one place to another (example: a piece of wood, a tool, a window, a door frame, etc.).Work= Force x Distance
Force= Mass x Acceleration Work= Mass x Acceleration x Distance Mass of piece of wood: 14.og Acceleration:10m/s F= 14*10*0.706 F=98.84N W=98.84N*1.285m W=127.009J |
Now let's say that you have to move many of whichever item you chose from the above question in 20 minutes. How much power will you exert?
Work=127.009J
Time=1,200s
Power= Work/Time
Power=127.009/1,200=0.105N
Time=1,200s
Power= Work/Time
Power=127.009/1,200=0.105N