Simple machine 2

Simple machine 2

Example

• John wants to move a 400N. rock with a 5m. crowbar. He puts the fulcrum 0.9m from the rock. How much force must he use to move the rock?

• STEP 1:

• Let x = force used

Formula

• In order for the above lever to be balanced, the following equation must be satisfied.

  
  

• w1 × d1 = w2 × d2

• Step 2: Sketch the diagram

• Step 3: Obtain equation from the diagram

• 9 × 400 = 60 × x

• A See-Saw is 25 feet long with a fulcrum in the middle of the board. If a 60 lb. child sits three feet from the fulcrum, where must a 100 lb. child sit to balance the 60 lb.

• Formula

• w1d1=w2d2

Multiple Choice

What class lever is a fishing rod?

• 1st

• 2nd

• 3rd

Multiple Choice

What class lever is a pair of scissors?

• 1st

• 2nd

• 3rd

Multiple Choice

What class lever is a pair of pilers?

• 1st

• 2nd

• 3rd

Multiple Choice

WHAT ARE THE 3 MAIN PARTS OF A LEVER?

• FOOT, EFFORT, REPORT
• FULCRUM, STRUCTURE, EFFORT
• FULCRUM, EFFORT, LOAD

Multiple Choice

A wheelbarrow is an example of a:

• 1st class lever
• 2nd class lever
• 3rd class lever

Multiple Choice

A see saw is an example of a:

• 1st class lever
• 2nd class lever
• 3rd class lever

Multiple Choice

Which type of lever is this?

• First Class Lever
• Second Class Lever
• Third Class Lever
• Coach  Class Lever

Multiple Choice

What class of lever is this?

• 1st class
• 2nd class
• 3rd class
• None of the above

Multiple Choice

Which is the following is an example of work, to a  scientist? 

• solving a mental math problem
• carrying a book across the room
• pushing against the floor
• lifting a chair of the floor?