Simple Machines

Which of the following is NOT one of the things a machine can do?

• Changes the amount of force required.

• Changes the distance over which the force is exerted.

• Changes the direction of the force.

• Changes the amount of work done.

Tags

NGSS.MS-ETS1-2

The fixed point around which a lever rotates is know as the

• wheel.

• fulcrum.

• input force.

• output force.

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

• lid of a jar

• turning on and off a faucet

• a drill bit

• a screw driver

How can simple machines make work easier?

• by decreasing the force needed to complete the task

• by increasing the friction between the machine and the object

• by adding more work on the object than originally applied

• by removing the force of gravity on the object

Which simple machine would be the MOST efficient for lifting an object 30 meters off the ground?

• pulley

• screw

• wedge

• lever

Which machine could be considered to be a type of inclined plane?

• wheel and axle

• lever

• screw

• pulley

A doorknob is a simple machine made up of 2 circular objects of different sizes. When turning a doorknob, what type of simple machine is being used?

• inclined plane

• wheel and axle

• wedge

• pulley

Workers push a heavy box up an inclined plane and onto a moving truck. Which best explains why these workers use an inclined plane?

• It makes their work easier because it requires less effort.

• It decreases the amount of work they have to do.

• It increases the amount of friction necessary to do the task.

• It makes the box weigh less.

Tags

NGSS.MS-PS2-2

A group of workers needs to move a piano from the second floor of a building. The piano is too wide to fit through the doorway, so they will lower the piano to the ground through a window. Which simple machine would be the best to help the workers lower the piano from the window?

• wheel and axle

• inclined plane

• pulley

• wedge

Tags

NGSS.MS-PS2-2

A house uses a roof to carry away large amounts of rain efficiently. A roof composed of 2 attached inclined planes would be considered which type of simple machine?

• wedge

• screw

• ramp

• lever