Exploring Friction and Wear

What does the word 'tribos' mean?

• Rubbing or friction

• Sliding or gliding

• Breaking or shattering

• Heating or melting

What is tribology the study of?

• The study of electrical conductivity in metals.

• The study of chemical reactions in materials.

• Tribology is the study of friction, wear, and lubrication.

• The study of thermal expansion in solids.

How did early humans create fire?

• By using chemical reactions with minerals.

• Through the use of metal tools and machinery.

• By capturing and storing sunlight in glass containers.

• Early humans created fire through friction methods and by using natural sources like lightning.

What invention was made around 3500 B.C.?

• The printing press

• The compass

• Writing (cuneiform script)

• The wheel

What is easier, rolling or sliding?

• Sliding is always easier

• Rolling

• Rolling requires more effort

• Sliding is faster than rolling

Who formulated the basic laws of friction in 1495?

• Leonardo da Vinci

• Isaac Newton

• Galileo Galilei

• Albert Einstein

What are the two basic laws of friction?

• The force of friction increases with surface area.

• The force of friction is always equal to the weight of the object.

• The force of friction is dependent on the material type only.

• 1. The force of friction is proportional to the normal force. 2. The force of friction is independent of the surface area.

When did Guillaume Amontons rediscover the laws of friction?

• 1715

• 1701

• 1689

• 1699

What does friction depend on according to Leonardo?

• The temperature of the environment.

• The speed of the moving object.

• The weight of the object only.

• The nature of the surfaces and the pressing force.

Why did Leonardo not get credit for his work?

• He was overshadowed by other artists of his time.

• His work was lost and never discovered.

• He lacked proper documentation and recognition during his time.

• He chose to remain anonymous throughout his career.