Which statement correctly explains a compound machine?

• A compound machine is made up of one or more simple machines

• A compound machine is made up of two or more simple machines.

• A screw is a type of inclined plane.

• None of the above

The illustration shows a person removing the lid from a crate with a crowbar. Which statement describes the force on the crowbar and the motion of the lid?

• As the crowbar is pushed down, the lid moves down.

• As the crowbar is pushed down, the lid moves up.

• As the crowbar is pulled up, the lid moves down.

• As the crowbar is pulled out, the lid moves up.

Tags

NGSS.MS-PS2-2

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

What do you call a machine made up of two or more simple machines?

• complicated machine

• compound or complex machine

• comprehensive machine

• constructive machine

A complex machine is:

• the same as a single simple machine

• two simple machine only

• two or more simple machines

• four simple machine

Two inclined planes together that helps push things apart.

• pulley

• wedge

• gear

• lever

Which of the following is NOT a complex machine?

• bicycle

• ramp

• can opener

• wheel barrow

• Simple machine

• Complex machine

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

NGSS.MS-ETS1-4

Which of the following is an example of a complex machine?

• A bicycle

• A lever

• A pulley

• A screw

What is the primary advantage of using a complex machine?

• It reduces the amount of work needed

• It increases the speed of work

• It combines multiple functions

• It requires less maintenance

Tags

NGSS.MS-ETS1-2