Friction

Question 1

friction

Answer 1

-force that acts at the interface of the surfaces in contact
-occurs in the direction opposite the impending motion
-static friction
-maximum static friction
-kinetic (sliding) friction

Question 2

modifying friction between two surfaces

Answer 2

alter nature of bearing surfaces
-changing the force that hold surfaces together
-changing contact area

Question 3

Coefficient of friction

Answer 3

-2 forces govern the magnitude of the force of max static friction or kinetic friction

Question 4

more surface contact

Answer 4

more friction

Question 5

C of F is a unitless number

Answer 5

-indicates relative ease of sliding
-amount of mechanical and molecular interaction between two surfaces in contact
-greater the interaction the greater the friction

Question 6

normal reaction force

Answer 6

-magnitude of vertical force acting on a body sitting on a horizontal surface= magnitude of weight
-can be intentionally altered

Question 7

push vs pull

Answer 7

-greater friction w pulling

Question 8

altering normal reaction force

Answer 8

• -w just sled
  -w kid and sled
  -w kid, sled and dog

Question 9

rolling friction

Answer 9

-occurs when the curved surface and the flat surface are deformed during contact

Question 10

influences

Answer 10

-COF between surfaces
-reaction force
-size of the radius of the object