What is then name for the pivot point in a lever system?
fulcrum
100
What are the two types of advantages given by pulleys?
Directional and mechanical
100
What is our unit for measuring effort, and who was it named after?
Newtons. It was named after Isaac Newton
200
What class lever would a hammer be?
class 3
200
If Joe lifts a 20 lb. bag of concrete using a single fixed pulley, how many pounds is the bag going to feel like?
20 lbs.
200
When reading a spring scale, what do each of the dark, longer lines represent?
1 Newton
300
Do a nutcracker and a scissors belong to the same class of levers?
NO. A nutcracker is a class 2 and a scissors is a class 1
300
When do you need to add .5 Newtons to your spring scale reading?
When the effort is being pulled down (any time you have a directional advantage)
300
On a spring scale, what does each of the small lines between whole numbers represent?
.2 Newtons
400
Explain how the human arm is used as a pulley. What class lever would it be?
Class 3 lever
400
Which type of pulley reduces the effort by 3/4?
Single fixed single movable up pulley
400
I am lifting a load using a single fixed single movable pulley down. The spring scale shows that the load weighs 4 Newtons. How much does the load weigh?
4.5 Newtons (you need to add .5 because you are pulling DOWN).
500
If Mrs. Waszak were trying to lift Big Erik on the see saw, how could you give her the greatest advantage?
Big Erik would be very close to the fulcrum, and Mrs. Waszak would be far from the fulcrum.
500
When there are two ropes supporting the load, how much is the effort reduced?
The effort is reduced by 1/2
500
You are lifting a bag of cement that weighs 100 lbs. You decide to use a single fixed single movable pulley up. How many pounds is the bag of cement going to feel like?