Exploring Screws

The video tutorial explains how certain pieces of furniture and docks are held together using screws, a type of simple machine. It describes a screw as an inclined plane wrapped around a cylinder, which, when force is applied, exerts an outward force on the wood. The tutorial highlights that the closer the threads on a screw, the greater the mechanical advantage, allowing screws to hold materials like wood together effectively. It also mentions other devices that use the principles of screws, such as drill bits, bolts, and jar lids.

What type of simple machine is used to hold furniture and docks together?

• Wedge

• Screw

• Pulley

• Lever

How can a screw be described in terms of simple machines?

• A wheel and axle

• A lever with a fulcrum

• An inclined plane wrapped around a cylinder

• A pulley system

What happens when force is applied to a screw?

• The threads exert an outward force

• The screw shortens

• The screw rotates without effect

• The screw compresses the material

What is the effect of having closer threads on a screw?

• It makes the screw weaker

• It decreases the mechanical advantage

• It makes the screw longer

• It increases the mechanical advantage

Which of the following is NOT an example of a device that uses the principles of screws?

• Drill bit

• Bolt

• Lid of a jar

• Pulley