Momentum and Newton's Laws

Question 1

What is the equation for linear momentum?

Answer 1

mass x velocity

Question 2

Is momentum a vector or scalar?

Answer 2

vector

Question 3

Law of conservation of momentum:

Answer 3

in a closed system momentum before an event is the same as the momentum after

Question 4

What is conserved in an elastic collision?

Answer 4

momentum and energy

Question 5

What is lost in an inelastic collision?

Answer 5

kinetic energy

Question 6

What is newton’s second law?

Answer 6

the rate of change of momentum an object experiences is proportional to the resultant force of the object

Question 7

Prove f=ma if mass is constant:

Answer 7

F∝p/t
F=k(p/t)
k=1
F=(mv-mu)/t
F=m(v-u)/t

Question 8

What is newton’s first law?

Answer 8

an object will remain at rest or continue to move with a constant velocity unless a resultant force acts on the object

Question 9

What is newton’s third law?

Answer 9

when two objects interact they exert equal and opposite forces of the same type on each other.

Question 10

What happens to momentum when an object hits a wall and rebounds elastically?

Answer 10

KE Before=KE After
0.5mv²=0.5mv²
momentum before= mv
momentum after= -mv
change in momentum= -mv-mv=-2mv
F=p/t=(-2mv)/t
t=time in contact

Question 11

What is the equation of impulse?

Answer 11

force x time

Question 12

How do you find impulse on a force time graph?

Answer 12

area under graph

Question 13

What is the equation for horizontal momentum in 2 dimensions?

Answer 13

p=(m1v1cosx)+(m2v2cosx)

Question 14

What is the equation for vertical momentum in 2 dimensions?

Answer 14

p=(m1v1sinx)-(m2v2sinx)