Physical Science-Simple Machines

An arrangement of fixed and movable pulleys is called a:

• gear

• wheel and axle

• bock and tackle

• pulley system

An inclined plane wrapped around a cylindrical post is a:

• screw

• wedge

• wheel and axle

• block and tackle

A bar that is free to move about a fixed point is called a:

• wedge

• ramp

• lever

• pulley

Match the following

• resistance force

• The amount by which a machine makes work easier

• efficiency

• A comparison of the work output to the work input of a machine

• mechanical advantage

• The force applied by a machine

• effort force

• The force applied to a machine

A machine makes work easier by:

• changing the direction of the applied force

• changing the size of the applied force

• changing the distance over which the force is applied

• increasing the work being done

In a first class lever the ​ (a)   is in the middle.

In a second class lever the ​ (b)   is in the middle.

In a third class lever the ​ (c)   is in the middle.

• fulcrum
• load
• effort force

Identify the following simple machines

• inclined plane

• a chain or rope that runs through a grooved wheel

• wheel and axle

• an object with one or two sloping sides that is used to move objects apart

• pulley

• a bar that is able to pivot around a fixed point

• lever

• a slanted surface used to raise an object

• wedge

• one rounded object that turns another smaller rounded object

A device that makes work easier with only one movement is called a ____ machine.

A combination of two or machines operating together to perform a task is called a ___ machine.

A pulley and wheel and axle are actually modified ​ (a)   .

• levers
• inclined planes

Tags

NGSS.MS-PS2-2