Simple Machines

A pulley is ________________________________________________

• 1. a bar used to lift heavy objects

• 1. a wheel with a groove for a rope

• 1. made of two inclined planes

• 1. a lever with an arm and a fulcrum

Which of the following simple machines helps make work easier?

• 1. wedge

• screw

• lever

• all of the above

An inclined plane _________________________

• 1. uses a bar to lift heavy objects

• can be a ramp

• 1. is a wheel with a groove for a rope

• 1. has a lever arm and a fulcrum

A screw is a cylinder with _____________________ wrapped around it.

• a lever

• a wedge

• an inclined plane

• a wheel and axle

Which is an example of a wheel and axle?

• hammer

• wagon

• ramp

• flag pole

What type of simple machine is a mountain road?

• lever

• wedge

• inclined plane

• wheel and axle

Annie twists the cap off the bottle of juice. What type of simple machine is the cap?

• screw

• pulley

• wheel and axle

• inclined plane

How can you create a compound machine?

• 1. add more wheels to a pulley system

• 1. combine two or more simple machines

• 1. exert more force on an object

• 1. none of the above

Which of the following best explains why lifting a heavy object with a single fixed pulley makes the task seem easier?

• 1. less force is needed to lift the object

• 1. less work is done when moving the object

• 1. the direction of the force needed to lift the object is changed.

• 1. the direction of the force needed to lift the object has not changed.

What is “load”?

• the work

• a compound machine

• a simple machine

• the object being moved