Simple Machines Study Guide and Practice Exam

Flashcards covering definitions, parts, and examples of the six simple machines and compound machines based on the lecture study guide and test bank.

Work is defined as the use of __________ to move an object.

force

Work is only done when a force moves an object; if an object does not __________, it is not work.

move

A simple machine helps make doing work easier and requires only __________ force to use it.

$$1$$

A __________ is a bar that pivots, or turns, on a fixed point.

lever

The fixed point on a lever that does not move is called the __________.

fulcrum

The three parts of a lever include the load, the fulcrum, and the __________.

force

Seesaws, crowbars, and shovels are all examples of a(n) __________.

lever

A(n) __________ is made up of a wheel that turns around a stiff bar, which are connected so that they turn together.

wheel-and-axle

A wheel-and-axle uses a(n) __________ motion to increase force.

circular

Examples of a wheel-and-axle include roller skates, a doorknob, and a(n) __________.

pencil sharpener

A __________ is a wheel with a rope, cord, or chain around it used to change the size or direction of a force.

pulley

Common examples of a pulley include a flagpole, window blinds, and a(n) __________.

sail on sailboat

A(n) __________ is a flat surface that is slanted so that one end is higher than the other.

inclined plane

An inclined plane lets you lift a load using a smaller force over a(n) __________ distance.

greater

A __________ is made of two inclined planes put back to back with one sharp, pointed edge.

wedge

If you apply force to the flat edge of a wedge, the __________ edge can split one thing into two parts.

pointed

A knife and a(n) __________ are both examples of a wedge.

ax

A __________ is an inclined plane or thread wrapped around a shaft or cylinder.

screw

On a screw, the closer together the __________ are, the easier it is to turn.

threads

Examples of a screw include a wood screw, a cork screw, and a(n) __________.

jar lid

A(n) __________ machine is made up of a combination of two or more simple machines.

compound

Scissors, bicycles, and wheelbarrows are examples of __________ machines.

compound

A simple machine makes work easier because using it takes __________ force to move something heavy.

less

In a model consisting of a pole, a spool, and a book, the __________ represents the wheel of a pulley.

spool

To lessen the amount of force needed to push a box up a ramp, a person should use a ramp that is __________.

less steep