Momentum

Question 1

What is momentum?

Answer 1

Mass in motion

Vector quantity

Units are kg*m/s

Question 2

Momentum formula

Answer 2

p=mv

Question 3

What is impulse?

Answer 3

a force must act on an object for a time in order to change its velocity

Question 4

Impulse momentum theorem

Answer 4

Change in momentum

Question 5

Units of impulse

Answer 5

N*s

Question 6

What kind of quantity is impulse?

Answer 6

Vector quantity

Question 7

If speed stays the same…

Answer 7

whether little/big force or little/large amount of time is applied, momentum is the same

Question 8

Force is less if…

Answer 8

contact time is longer

Question 9

Real world applications?

Answer 9

airbags

padded dashboards

Boxer’s riding the punch

Baseball and tennis players following through

Question 10

Area under the F vs t graph is…

Answer 10

Impulse

Question 11

How to find impulse on a graph?

Answer 11

area of a rectangle (bh) and area of a triangle (1/2*bh)

Question 12

What can Fnet (impulse) * time be represented by?

Answer 12

ΔP

Question 13

Ns is equal to what other unit?

Answer 13

Kg* m/s

Question 14

Change in momentum

Answer 14

Mvf-mvi

Question 15

Laws of conservation of momentum?

Answer 15

The momentum of any closed, isolated system does not change

No external forces act on the system

Question 16

Elastic collisions

Answer 16

Both energy and momentum are conserved

EX: pool balls bounce back perfectly

Question 17

Inelastic collisions

Answer 17

Only momentum is conserved

Energy is changed to some other form

Question 18

Fundamental law of physics

Answer 18

P1i +P2i= P1f+P2f

AKA

Pbefore= Pafter

Question 19

Fundamental law of physics

Answer 19

P1i+P2i= P1f+P2f

a.k.a

Pbefore=Pafter

Question 20

Elastic collisions

Answer 20

both energy and momentum are conserved

EX: pool balls will bounce back perfectly

Question 21

Ineleastic collisions

Answer 21

only momentum is conserved

energy is changed to some other form