Test 2 Ch.'s 6-12

Question 1

Newton’s first law

Answer 1

The law of inertia, v= constant unless there’s a net force

units: kg

Question 2

Newton’s second law

Answer 2

Fnet=ma

Question 3

Newton’s third law

Answer 3

for every action there is an equal, in magnitude, and option, in direction, reaction

Question 4

Criteria for Newton’s third law

Answer 4

forces must be equal in magnitude
forces must be opposite in direction
forces must be on different objects

Question 5

Where does kinetic friction alway point?

Answer 5

opposite of motion

Question 6

sin is

Answer 6

opposite

Question 7

cos is

Answer 7

adjacent

Question 8

all angular quantities…

Answer 8

point along the axis of rotation

Question 9

______ is the positive direction

Answer 9

counterclockwise

Question 10

Period

Answer 10

how long it takes to make 1 revolution

Question 11

collision

Answer 11

short term interaction between two or more objects

Question 12

units of momentum

Answer 12

kg m/s or Ns

Question 13

What is the relationship between Pi and Pf?

Answer 13

they are equal in an isolated system

Question 14

inelastic collision

Answer 14

momentum is conserved

Question 15

elastic collision

Answer 15

momentum and kinetic energy are conserved

Question 16

perfectly inelastic collision

Answer 16

inelastic collision in which the objects stick together

Question 17

if two objects collide how can Pf be written?

Answer 17

m1v1f+ m2v2f becomes (m1 + m2)Vf

Question 18

Energy

Answer 18

work a system can do

Question 19

kinetic energy

Answer 19

energy of motion

Question 20

potential energy(U)

Answer 20

energy of position

Question 21

Work

Answer 21

the transfer of energy between systems

Question 22

Conservation of energy

Answer 22

Ef=Ei

Kf + Uf= Ki + Ui

Question 23

units of energy

Answer 23

Joules(J)

Question 24

Work energy Theorem

Answer 24

W=-delta U=delta K

Question 25

Projectile motion with energy looking for Vf

Do I split kinetic energy into x and y components?

Answer 25

no

Question 26

Projectile motion with energy look for Ymax

Do I split kinetic energy into x and y components?

Answer 26

yes

Question 27

What does a conservative force conserve?

Answer 27

energy

Question 28

Properties of a conservative force

Answer 28

W=- delta U
Energy is reversible: KEPE
Energy is independent of path
If end points are the same(d=0) then W=0