SIMPLE MACHINES & CLASSES OF LEVERS

A student uses this tool to build a project made from wood.  The student uses Part X to remove a nail from the wood.  Part X is being used as a 

• a lever
• a screw
• an inclined plane
• a wheel and axle

Which inclined plane makes work easiest?

• A very steep one
• A very long one
• A very wide one
• A very skinny one

Tags

NGSS.MS-PS2-2

The place where a lever pivots is called the _______.

• Load
• Force/Effort
• Fulcrum
• Rigid Bar

_________ is an example of a lever.

• Hammer
• Crowbar
• Wheelbarrow
• All of the above

Simple machines (lever, inclined plane, wedge, screw, pulley, wheel and axle) do which of the following?

• Reduce the mass of an object that needs to be moved
• Reduce the distance an object needs to be moved
• Reduce the amount of time needed to move an object over a distance
• Reduce the force needed to move an object over a distance

A simple machine that is made up of an inclined plane wrapped around a cylinder. It is often used to hold things together.

• lever
• screw
• wedge
• velcro

How does a single fixed pulley, like the one seen here, help you do work?

• changes the direction of the force

• increases the amount of applied force

• decreases the amount of applied force

• allows you to pull the rope a shorter distance

Any device that makes work easier is called a ______________________.

• Joule 
• prop
• lever
• machine

A ______________ is a rope belot or chain wrapped around a wheel. 

• wedge 
• lever 
• pulley 
• screw

No machine in existence has 100% efficiency due to ____________________.

• magic
• friction
• smoke
• input