History of Friction
Why didn't Da Vinci get credit for his work?
He never published his work
What energy does the kinetic energy of a vehicle transfer to for a car to stop?
Thermal (Heat)
What is the area you aim for in Curling called?
The button
What opposes friction?
Motion
Who created these two basic laws of friction?:
The areas in contact have no effect on the force of friction
If the load on an object is doubled, the force of friction is doubled as well
Leonardo Da Vinci
What year was the drum brake invented?
1900
Who tells the players where to throw the rock and where to sweep?
The skip
What happens to an object if the maximum force of static friction is stronger than the force of motion?
There object will not move
What did Da Vinci state about the roughness of a surface affecting friction?
Smoother surface = less friction, rougher surface = more friction
What are the two main types of in tire braking systems?
Drum Brakes and Disc Brakes
What is the difference between curling ice and skating ice
Curling ice is more bumpy with hills and valleys while skating ice is more smooth
What causes aquaplaning?
When a layer of water builds up between the tires of a vehicle and a surface
Who rediscovered Da Vinci's laws?
Guillaume Amontons
What is the problem with drum brakes?
Drum brakes are inside a metal drum, so they would heat up very quickly, the hotter the brakes are, the less friction there is. This causes the brakes to not work effectively
What does sweeping the ice do?
What is aquaplaning?
This is when the water between a vehicle tire and a surface cause the vehicle to glide across the water like a boat
What are microscopic bumps on the surface of objects called?
What is the problem with disc brakes?
Disc brakes can't be used as parking brakes because they expand when they're hot and contract when they cool down. If they were used to park then they would eventually cool and contract.
Why is curling ice bumpy?
Curling ice is bumpy so the rock doesn't slide and curl out of control
What are the three types of friction?
Static, Rolling, Kinetic