simple machines

A fishing pole is an example of a compound machine. What simple machines are used to make up this compound machine?

• lever, wheel and axle, pulley
• wheel and axle, inclined plane, pulley
• wheel and axle, pulley, inclined plane

A device that has two or more simple machines working together

• fulcrum

• pulley

• compound (complex) machine

• motor

In a first class lever, which part is found in the middle?

• The effort

• The fulcrum

• The load

• None of the above.

............ have the resistance force between the effort force and fulcrum.

• Third class levers

• First class levers

• Second class levers

• Fourth class levers

What is a simple machine?

• A device that makes work easier.

• Two or more simple machines combined.

• A device that multiplies a force.

• A machine that does not need a motor.

The ability to do work or cause change is called ___________

• force

• work

• energy

• power

SI unit of force

• kilogram, kg
• m/s/s
• kelvin, K
• newton, N

How does a single fixed puled, like the one seen here, help you do work?

• changes the direction of the force
• increases the amount of applied force
• decreases the amount of applied force
• allows you to pull the rope a shorter distance

What is a complex machine?

• A machine that needs a motor.

• A machine that is a combination of two or more simple machines.

• A machine whose mechanical advantage is ten.

• None of the above.

A screw makes work feel easier if the threads are

• closer together

• farther apart

• threads do not relate to making work feel easier