Chapter 11

Question 1

what is newtons 1st law?

Answer 1

• law of intertia

- body continues in state of rest of uniform motion unless unblanced force acts on it

Question 2

more force is required to ____ than ____

3 of them

Answer 2

• start moving than keep at rest (onject at rest)
• start moving than keep moving (object in motion)
• change speed/direction/stop than keep at same velocity (object in uniform motion)

Question 3

what is newtons 2nd law?

Answer 3

• law of acceleration

- F=ma

Question 4

if mass is constant…

Answer 4

-increase force = increase acceleration

Question 5

if force is constant…

Answer 5

-increase mass = decrease acceleration

Question 6

if acceleration id constant…

Answer 6

-increase in mass = increase in force

Question 7

what is newtons 3rd lar

Answer 7

• aw of action-rection

- for every force applied to one body on a second the second body applies an equal and opposite directed force on first

Question 8

what is responsible for change of motion of system in env’t

Answer 8

reaction force exterted by env’t that is exernal to system

Question 9

during push up what is responsible for upward motion of body

Answer 9

• upward reaction force from earth

- opposite of downward force hands exert onto earth

Question 10

during action reaction forces how can acceleration of each object be described?

Answer 10

object with smaller mass will expereience greater change in acceleration

Question 11

what is a joint reaction force?

Answer 11

reaction force created by a segment as the previous segment exerts an action force upon it

Question 12

what is the bone-on-bone force?

Answer 12

resultant force of the stabilizing component od my=uscular force and the joint reaction force

Question 13

what can the bone-on-bone force be resolved into?

Answer 13

• vertical or compressive force

- horizontal or shear force