Linear kinetics

Question 1

The greater the mass of an object or the faster it
moves, the___ the momentum

Answer 1

greater

Question 2

What is linear momentum?

Answer 2

product of objects mass and isntantaneous linear velocity

Question 3

what is momentum porportional to?

Answer 3

linear velocity

Question 4

What is the conservation of momentum principle - what is this used in the study of?

Answer 4

Total momentum of a system of objects is constant if the ΣF = 0
- used in study of collisions

Question 5

wht is elasticity of collisions determined by?

Answer 5

coeffciient of resititution (e)

Question 6

what is the coeff of resitution defined as?

Answer 6

ratio of the relative velocity after vs. before a collision

Question 7

what is the range of e?

Answer 7

0-1

Question 8

What is e in a perfecttly elastic collision? what does this mean?

Answer 8

perfectly elastic = 1 - objects collide and bounc off eachother - KE is conserved - m1v1)i + (m2v2)i = (m1v1)f + (m2v2)f

Question 9

What is e in a perfectly inelastic collision? What does this mean? ecample?

Answer 9

0, obejcts collide, stay together and moce together - combined momentumm still conserved but KE is lost - football players colliding mdiair

m1v1)i + (m2v2)i = (m1 + m2)vf

Question 10

so in a closed system momentum is conserved in all collisions but ______ is not

Answer 10

kinetic energy

Question 11

what type of realtionship does newtons second law describe?

Answer 11

cause-and-effect relationship

Question 12

Newtons first law is a spcial case of the seocnd law? why?

Answer 12

becuase its when ΣF = 0, so a = 0

Question 13

Newton’s Second Law (ΣF = ma) gives the net
external force or acceleration at ____ however we are more interesting in final outcome of forces over ___

Answer 13

an instant in time, a period of time

Question 14

a ___ will cause a change in the objet momemtnum according to newtons second law

Answer 14

impulse

Question 15

Impulse to increase momentum? how do we max velcoity in sports? incrae average for or time it is applied? for light objects ____ is more important and for heavy objects ___ is more improtant?

Answer 15

• we try to increase the average net
  force and/or the time it is applied
  technique (Δt; duration of force application) is most
  important with light objects
  – strength (ΣF; force that can be applied) is more
  important with heavy objects