The Power of Wedges

The video tutorial explains that a knife is a more effective tool due to its design as a wedge, a type of simple machine. Wedges are essentially two inclined planes joined together, and they function by splitting or cutting materials. The tutorial highlights that the mechanical advantage of a wedge increases when it is longer and thinner, which is why sharpening improves its cutting ability. Examples of wedges include doorstops, chisels, and plows.

What type of simple machine is a knife considered to be?

• Lever

• Pulley

• Screw

• Wedge

How can wedges be described in terms of inclined planes?

• As a single inclined plane

• As two inclined planes positioned back to back

• As a horizontal plane

• As a vertical plane

What is a powerful example of a wedge that can split wood?

• Hammer

• Drill

• Saw

• Axe blade

What happens to the mechanical advantage of a wedge as it becomes longer and thinner?

• It increases

• It becomes zero

• It decreases

• It remains the same

Which of the following is NOT an example of a wedge?

• Doorstop

• Chisel

• Wheel

• Plow