How machines make work easier

What is a machine?

• A three-dimensional representation of a thing typically on a smaller scale than the original.

• A preliminary model of something from which other forms are developed or copied.

• Any device that makes doing something easier.

• A simplified description of a system or process to assist calculations and predictions.

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To use a machine, such as a crowbar, you must apply a(n) ___ to it.

• output force

• input work

• input force

• output work

A machine changes the input force into a(n) ___.

• output distance

• output force

• input work

• input distance

You apply an input force that moves part of the machine certain distance and do ___.

• work

• efficiency

• power

• mechanical advantage

Machines convert input work to output work by applying a(n) ___ on something and making it move a certain distance.

• input time

• output power

• input power

• output force

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A machine can make work easier by changing:

• The size of a force.

• The distance the force acts.

• The direction of a force.

• All of the above.

A crowbar makes work easier by changing the input force into a ___ output force.

• smaller

• equal

• uniform

• larger

When the output force is greater than the input force, the output force acts over a ___ distance.

• shorter

• equivalent

• greater

• momentary

Using a rake to gather leaves is an example of a machine that ___ the distance over which a force acts.

• maintains

• perpetuates

• increases

• decreases

A ___ is an example of a machine that makes work easier by changing the direction of the input force.

• hammer

• pulley

• rake

• crowbar