Unit Recall: Simple Machines

Which kind of simple machine do the ramp and slope represent?

• pulley

• inclined plane

• wedge

• screw

• wheel and axle

What energy is present in a moving object?

• chemical energy
• kinetic energy
• nuclear energy
• potential energy

All of the following are types of simple machine except a _____________.

• fulcrum
• lever
• pulley
• wedge

What simple machine is shown in the picture?

• first class lever
• second class lever
• third class lever
• a pulley system

Which of the following situations show the use of a pulley?

• raising the flag
• locking the doorknob
• playing the seesaw
• cutting strips of paper

What type of simple machine is used in loading ships and heavy machinery?

• lever
• wedge
• pulley
• wheel and axle

Why do buildings have stairs?

• To make the building strong
• To make the buildings beautiful
• To make it easy to work over time
• To make it easy to carry heavy loads

What may happen if a thin rope is used to lift a heavy object?

• The rope will be able to lift the object.
• The rope may break and the object will fall.
• The object may not be moved from its place.
• The direction of the force may nit be changed.

How are screws useful?

• They lift objects.
• They increase force.
• They split objects apart.
• They join objects tightly.

Which of the following describes a wedge?

• It can pull objects up or down.
• A straight bar or rod that rotates about an axis.
• A ramp with one end higher than the other end.
• It can cut, tear, or break something into two or more parts.