The Wedge: Splitting More Than Just Logs

The video explores the legend of George Washington and the cherry tree, using it as a segue to discuss the mechanics of an axe, which is a type of wedge. It explains how wedges work by redirecting force to split objects and identifies common wedges like knives and doorstops. The video also covers the concept of friction, particularly in the context of a doorstop, and highlights the historical significance of wedges as one of the oldest tools used by human ancestors.

What simple machine is an axe an example of?

• Lever

• Pulley

• Wedge

• Screw

How does a wedge change the direction of the force applied?

• It stops the force

• It redirects the force sideways

• It amplifies the force

• It reduces the force

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

• Wheel

• Doorstop

• Chisel

• Knife

What force does a doorstop introduce to keep a door from closing?

• Magnetism

• Friction

• Tension

• Gravity

How long have human ancestors been using wedges as tools?

• A few hundred years

• Since the industrial revolution

• Only in modern times

• Over a million years