Lecture 18 - The Impulse Momentum Relationship

Question 1

what is inertia

Answer 1

is the observed natural tendency of an object in motion to keep moving in the same direction and at the same speed or if at rest, to stay at rest

Question 2

inerta =

Answer 2

resistance to change in motion state

Question 3

what is L

Answer 3

momentum

Question 4

what is momentum equal to

Answer 4

momentum (L) = mass x velocity

Question 5

a heavy object travelling fast will have a ….. momentum than a light object travelling at the same speed

Answer 5

greater momentum

Question 6

change in velocity causes an object to

Answer 6

accelerate or decelerate

Question 7

the magnitude of acceleration or deceleration is proportional to the

Answer 7

to the net force acting on the object and inversely proportional to the mass

Question 8

in the basic Tennent of Mechanics (sum of forces = mass x acceleration), acceleration is directly proportional….

Answer 8

proportional to and in the same direction as net force

Question 9

what is the impulse momentum equation

Answer 9

Ft = mVfinal - mVinital

Question 10

what part of the impulse momentum equation is impulse

Answer 10

the first part (Ft)

Question 11

what part of the impulse momentum equation is momentum

Answer 11

the second part (mVfinal - mVinital)

Question 12

equation of how we change the state of motion of a system

Answer 12

impulse of net external forces exerted on the system = change in momentum of the system

• there is an equation i can’t copy in the lecture slides

Question 13

impulse is = to what area

Answer 13

the area under the force curve

Question 14

in order to change our momentum we need to apply a force to change direction, this is

Answer 14

initial momentum we have, plus whatever we push adds to the magnitude of our change

Question 15

the person who is most successful in change in direction will

Answer 15

the person who loses the least momentum

Question 16

momentum describes the quantity

Answer 16

of motion a mass has based on its velocity

Question 17

what do anterior and posterior forces tell us when walking

Answer 17

propulsion and breaking forces

Question 18

if our momentum isn’t changing, this tells us the net impulse is

Answer 18

0

Question 19

if the net impulse is 0

Answer 19

anterior and posterior impulse have to be equal and opposite

Question 20

what does the net impulse have to be if we are increasing our momentum

Answer 20

net impulse has to be positive because that will give you a positive change in momentum

Question 21

if we are decreasing velocity what will the net impulse be

Answer 21

negative cause we have to take away from our initial momentum, that would be increasing breaking impulse

Question 22

when velocity is the important performance outcome, we can maximise performance by maximising

Answer 22

GRF