Gears and Levers

Which is true of a 1:3 ratio?

• a large gear must turn 3 times to make a small gear turn 1 time

• a small gear has to turn 4 times to make the large gear turn 1 time

• a large gear has to turn 4 times to make the small gear turn 1 time

• a small gear has to turn 3 times to make the large gear turn 1 time

Which best describes the relationship between a small gear with 8 teeth and a large gear with 40 teeth?

• 5 ratio

• 40 ratio

• 8 ratio

• 1 ratio

When discussing simple machines, what is effort?

• a type of simple machine

• the force you apply to move an object

• what the simple machine is lifting

• the point where the lever pivots

What class lever is a pair of pilers?

• 1st

• 2nd

• 3rd

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What class lever is a nutcracker?

• 1st

• 2nd

• 3rd

What is torque?

• a stationary force that stays still

• a twisting force that causes rotation

• a forward force

• a backward force

The purpose of the IDLER GEAR is to ____________.

• change the speed of rotation

• make the model harder to build

• add more gears for fun

• change the direction of rotation

To INCREASE speed of rotation, you can ____________________.

• add more gears

• change from a LARGE gear to a SMALL gear

• turn the handle less times

• change from a SMALL gear to a LARGE gear

Tags

NGSS.MS-PS2-1

The place where a lever pivots is called the _______.

• Pivot point

• Effort

• Fulcrum

• Load

What kind of lever is this?

• First Class Lever

• Second Class Lever

• Third Class Lever