Simple Machines and Efficiency

A seesaw is what simple machine?

• lever

• inclined plane

• pulley

• gear

doorknob is an example of a _______.

• wheel and axle

• inclined plane

• pulley

• wedge

Which of the following is NOT an example of the simple machine know as a screw?

• the lid of a jar

• a bolt

• a drill bit

• a crowbar

A complex machine is:

• the same as a single simple machine

• two simple machine only

• two or more simple machines

• four simple machine

A wheelbarrow is an example of a complex machine. Which simple machine is NOT found in this object?

• lever

• wedge

• wheel and axle

Which simple machine would most likely increase the distance and reduce the force needed for a rolling cart to be moved up three steps?

• lever

• screw

• pulley

• inclined plane

Tags

NGSS.MS-PS2-2

The mechanical advantage available from a pulley could best help in which situation?

• pushing a car

• rotating a wheel

• flying an airplane

• lifting an elevator

Tags

NGSS.MS-PS2-1

The greatest amount of force is required to move the metal block up which inclined plane?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-2

A log splitting machine was invented to split logs quickly. A motor powers a metal piece that is pushed through the middle of a log. The metal piece used to split a log is an example of what simple machine? 

• wedge

• pulley

• screw

• lever

Tags

NGSS.MS-PS2-1

The picture shows a student using a pulley system to raise a flag. Which statement correctly describes the function of this system?

• The more force used to pull the string, the more string will be needed to raise the flag.

• The more force used to pull the string, the faster the flag will move up the flagpole.

• The less force used to pull the string, the greater the distance the flag will move.

• The less force used to pull the string, the longer the flag will remain raised.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1