Simple Machines #2

What is the ability to do work the definition for?

• work
• energy
• force
• strength

The use of force to move an object is the definition for: 

• energy
• work
• force 
• strength 

Which of the following is the best example of work being done. 

• doing homework
• lifting a box
• pushing a stationary box
• carrying a box

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

• magic
• friction
• smoke
• input

A rigid bar free to move about a fixed point is a ______________________.

• screw 
• lever
• wedge 
• pulley

If you want to make a lever have a greater mechanical advantage you should do what?

• increase the length of the effort arm
• increase the length of the resistance arm.
• make a higher fulcrum
• lift harder

What type of pulley has the greatest mechanical advantage?

• Single.
• Compound. 
• Fixed.
• Rolly pulley.

A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.  

• wedge
• screw
• lever
• inclined plane 

The place where a lever pivots is called the _______.

• Load
• Force/Effort
• Fulcrum
• Rigid Bar

A fishing pole is an example of a compound machine. What simple machines are used to make up this compound machine?

• lever, wheel and axle, pulley
• wheel and axle, inclined plane, pulley
• wheel and axle, pulley, inclined plane