Lesson on Levers

A see saw is an example of a:

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

This is the fixed point that a lever pivots around

• load

• scale

• fulcrum

• effort

The nutcracker is the example of .......................

• First Class of lever

• Second Class of lever

• Third Class of lever

• Fourth Class of lever

What is definition of the effort?

• The fixed point or pivot
• The point where the force is applied 
• The point where the weight/resistance is coming from

The diagram shows a crowbar used to lift an object. What parameters should be change to lift heavy object with small effort applied?

• Decrease distance r1

• Increase distance r1

• Increase distance r2

• r1 must be same as r2

Tags

NGSS.MS-ETS1-1

1. A _________is a simple machine with a fulcrum and a rigid bar.

• Pivot
• Lever
• Wedge

Tags

NGSS.MS-PS2-1

6. What kind of lever is this?

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

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How many types of levers are there?

• 1
• 2
• 3
• 4

The resistance force and the effort force are on the opposite sides of the fulcrum in this.

• First class 
• Second Class
• Third Class
• Fourth Class

If you want to decrease the effort force when using a lever, where will you move the fulcrum? 

• Closer to the object you want to move
• Farther away from the object you want to move
• You don't move the fulcrum, you move the effort force
• None of these answers 

Tags

NGSS.MS-PS2-2