linear kinetics - lesson 1

Question 1

define force

Answer 1

the pulling or pushing effect of a body on another body

Question 2

what can a force do?

Answer 2

get objects moving
stop objects
change direction of a moving object
change speed of a moving object 
balance another force to keep an object still

Question 3

what are the external forces?

Answer 3

gravity
friction
air resistance
water resistance

Question 4

what are the internal forces?

Answer 4

the action of muscles and tendons on the skeletal system

Question 5

define newtons first law

Answer 5

a body continues in its state of rest or motion unless acted upon by a force

Question 6

define newtons second law

Answer 6

the acceleration of a body is proportional to the force applied to it and inversely proportional to the mass of the object
force = mass x acceleration

Question 7

define newtons 3rd law

Answer 7

for every action, there is an equal and opposite reaction

Question 8

define inertia

Answer 8

the amount of resistance an object has to a change in an object’s state of motion
- greater inertia = greater force required to initiate movement or change its motion

Question 9

define momentum

Answer 9

a measure of the amount of motion possessed by a moving object
momentum = mass x velocity