Lesson 2.6: CD Connect

Insert the Science.Connect 1 CD Student Multimedia CD into your computer CD player.  Launch the applet Introduction to Levers.  Work through the ten pages of this applet. 

Question 1. One of the pages had a hammer pulling out a nail.  What was the fulcrum in this lever?

Question 2. One of the pages had a diagram of a wheelbarrow.  Where is the fulcrum on a wheelbarrow?

Then, return here to continue this lesson.

 

 


Now, launch the applet Levers as Multipliers.  Work through the eleven pages of this applet.

Question 3. In a first class lever, the --- (shorter, longer) the load distance, the less effort is needed to lift the load.

Question 4. When you move the fulcrum of a first class lever towards the effort, you --- (increase, decrease) the amount of effort required to lift a constant load.

Question 5. When you move the fulcrum of a first class lever towards the load, you --- (increase, decrease) the load that can be lifted with a constant effort.

Question 6. Do all first class levers change the direction of the force?

 

Then, return here to continue this lesson.

 

 

 

 

 

 

 

 

 

 

 

 

Answers to Questions:

Question 1. One of the pages had a hammer pulling out a nail.  What was the fulcrum in this lever?

The fulcrum is the middle of the hammer head as shown below.

                           

Question 2. One of the pages had a diagram of a wheelbarrow.  Where is the fulcrum on a wheelbarrow?

The fulcrum on a wheelbarrow is the axle of the wheel.  You could also say the fulcrum is the wheel.

 

 

Click to return to where you left off in this lesson.

 

 

 

 

 

 

 

 

 

 

 

Answers to Questions:

Question 3. In a first class lever, the --- (shorter, longer) the load distance, the less effort is needed to lift the load.

In a first class lever, the shorter the load distance, the less effort is needed to lift the load.

Question 4. When you move the fulcrum of a first class lever towards the effort, you --- (increase, decrease) the amount of effort required to lift a constant load.

When you move the fulcrum of a first class lever towards the effort, you increase the amount of effort required to lift a constant load.

Question 5. When you move the fulcrum of a first class lever towards the load, you --- (increase, decrease) the load that can be lifted with a constant effort.

When you move the fulcrum of a first class lever towards the load, you increase the load that can be lifted with a constant effort.

Question 6. Do all first class levers change the direction of the force?

All first class levers change the direction of the force.  If you push down, the load is pushed up.  If you pull up, the load is pushed down.


Click on the page forward to continue Lesson 2.