Simple and Complex Machines

The fixed point on the lever is called

• load

• resistance

• bar

• fulcrum

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

• complicated machine

• compound machine

• comprehensive machine

• constructed machine

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.

How can the lever be balanced?

• add weight to the right side

• move the fulcrum right

• move the heavier weight back

As a staircase is an example of an ​ (a)   , the spiral staircase is an example of a ​ (b)   .

• inclined plane

• screw

• wedge

What simple machines are found in the following?

a

b

c

Wedge, wheel & axle

Lever, wedge and wheel & axle

Screw, wedge, and wheel & axle

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

An example of a lever is

• doorstop

• drill

• staircase

• hammer

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of the following is true for the picture?

• elephant is the fulcrum, mouse is the effort, triangle is the load

• mouse is the fulcrum, triangle is the effort, elephant is the load

• triangle is the fulcrum, mouse is the effort, elephant is the load

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

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-PS2-1

Which statement correctly explains a compound machine?

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

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

• screw is a type of inclined plane.

• None of the above