Simple Machines

These two parts act as one simple machine. They roll and are found on cars, bikes and wheelbarrows.

• Wheel & Axle

• Screw

• Inclined Plane

• Lever

• Pulley

This simple machine can be used to lift a weight. It has a fulcrum, or pivot point, which can be located in the center, near the end or at the end.

• Wheel & Axle

• Lever

• Pulley

• Screw

• Inclined Plane

Examples of this simple machine are used to hold things together. It is made up of an inclined plane wrapped around a cylinder.

• Pulley

• Wheel & Axle

• Wedge

• Screw

• Lever

A heavy object could be rolled up this simple machine, instead of lifting it straight up. Using this simple machine can save effort, although the object must usually cover more distance if this simple machine is used.

• Inclined Plane

• Screw

• Lever

• Pulley

• Wedge

This is necessary to get something moving.

• resistance

• force

• wedge

• screw

A rod attached to the center of a wheel is called:

• a magnet

• a wedge

• a top

• an axle

What should you do to reduce the amount of effort needed to lift something using a first class lever?

• move the fulcrum to the middle of the lever

• move the fulcrum closer to the load

• move the fulcrum closer to the effort

The efficiency of a simple machine is

• is always less than 100%

• is equal to 100%

• is always 50%

• is always more than 100%.

If the mechanical advantage of a simple machine is 4, then the

• output force is 4 times the effort

• effort is 4 times the output force

• efficiency is 4%

• the work output is 4 times the input

Which of the following statements is true for Figure 1.

• B – is the fulcrum, C- is the resistance, A – is the effort

• B – is the resistance, C – is the fulcrum, A – is the effort

• B – is the fulcrum, A – is the effort, C- is the resistance

• B – is the resistance, A – is the fulcrum, C – is the effort