Science / Math
Connections
During our study of our Amusement Park unit we study many concepts of physics. Two of the concepts are work and power.
How do we measure and determine work? Work is the distance times the weight. We measured distance in meters and weight in newtons. The kids on the left are measuring Danielle's book bag. Her book bag weighed 35 newtons. We carried her book bag to the bench out side Miss.Crumbacher's office. It was 23 meters. 23 meters x 35 newtons= 805 joules.
We did this our recycling bin and our book box.
How do we measure and determine power? Once again we used Danielle's book bag. To find power we first had to find the work to carry the book bag to her house. Her house is about 3 kilometers or 3000 meters from school. So, the work was 105 joules (3000 meters x 35 newtons = 105,000 joules).
Then we asked, "What would require more power; carrying Daniel's bag home to her house in 30 minutes or 60 minutes?" Most everyone knew it would take more power to do something faster.
The formula for power is power = work / time. So the amount of work to carry the book bag to Danielle's in 30 minutes is…105,000joules(work)/30min =
3500 joules/min or 58 joules / second.
We predicted that the amount of work to carry the book bag to Danielle's in 60 minutes would be less. We were right. 105,000/60min =
1750 joules/min or 29 joules / second.
There are 3 parts to a lever