linear kinetics

Question 1

what is inertia?

Answer 1

a resistance to change in motion

Question 2

what is mass?

Answer 2

the quantity of matter of which a body is composed

Question 3

what is force?

Answer 3

the pushing/pulling effect that one body has on another/the tendency to alter a body’s state of motion

Question 4

what are the two classifications of forces?

Answer 4

internal and external

Question 5

what are internal forces?

Answer 5

forces within the body, typically produced by muscles, tendons and ligaments pulling on bones

Question 6

what are external forces?

Answer 6

any forces from outside the body

Question 7

what is ground reaction force equal to?

Answer 7

the individual’s weight

Question 8

in which direction does weight force go on a free body diagram?

Answer 8

down (same as gravity)

Question 9

why does drag occur?

Answer 9

due to air resistance

Question 10

what experiences drag?

Answer 10

any object moving horizontally

Question 11

when is ground reaction force acting?

Answer 11

if there’s contact with the ground

Question 12

when is reaction force acting?

Answer 12

if there’s contact with any external object

Question 13

what is newton’s 1st law of motion

Answer 13

every body continues in the same state unless acted upon by an external force

Question 14

what can newton’s 1st law be related to?

Answer 14

the concept of inertia

Question 15

what is newton’s 2nd law of motion?

Answer 15

a force actin on. body causes an acceleration which is in the direction of the force and which has a magnitude inversely proportional to the mass of the body

Question 16

what determines the body’s acceleration?

Answer 16

the net effect of forces acting on a body

Question 17

in what direction and acceleration will the object move when acted on by an external force?

Answer 17

in the direction of and with the acceleration proportional to the resultant force

Question 18

what can newton’s 2nd law be related to?

Answer 18

force = mass x acceleration

Question 19

what is newton’s 3rd law of motion?

Answer 19

for every action that’s exerted by a body on another, there’s an equal and opposite force exerted by the second body on the first

Question 20

how can newton’s 3rd law be linked to newton’s 2nd law?

Answer 20

the effects that the two bodies produce on each other is different due to differing masses and accelerations